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'''Compressor characteristic''' is the curve to show the behaviour of fluid like change in pressure, temperature, entropy, flow rate etc as it passes through the [[Gas compressor|compressor]] at different compressor speeds. The function of Compressors is to increase the fluid pressure that is the exit pressure is much higher than the inlet pressure and due to this property it is widely used like in refrigerator, cars, jet engine etc.
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These curves are plotted between various parameters and some are as follows
 
==Pressure ratio vs. Non-dimensional flow rate<ref name=Klassen>Klassen, H.A., `Performance of low pressure ratio centrifugal compressors with four diffuser designs`, NACA, TN 7237, March 1973.</ref><ref name=Nahimo>Nahimo, T. Etal., `Effect of Reynolds number on performance characteristics of centrifugal compressors with special reference to configurations of impellers`, ASME paper No.74-GT-59, 1974.</ref><ref name=Yahya>Yahya ,S.M, ”Turbine, Compressors & Fans”,4TH ED.McGraw Hill,2011.</ref>==
 
Performance of a compressor is usually specified by curves of delivery pressure against mass flow rate for various fixed values of rotational speed at given values of inlet pressure and temperature. These performance characteristic curves are usually plotted with dimensionless variables for this we start with implicit functional relationship of all the variables as <ref name=Yahya />
 
<math>F (D, N, \dot{m}, p_{01}, p_{02}, RT_{01}, RT_{02}) = 0  </math> <ref name=Yahya /><ref name="Horlock, J.H., Axial Flow Turbines">Horlock, J.H., Axial Flow Turbines, Kruger Publishing Co., 1973.</ref><ref name="Horlock, J.H., Axial Flow Compressors">Horlock, J.H., Axial Flow Compressors, Kruger Publishing Co., 1973.</ref>
 
Where
 
<math>D</math> = characteristic linear dimension of the compressor
 
<math>N</math> = rotational speed
<math>\dot{m}</math> = mass flow rate
 
<math>p_{01}</math> and <math>p_{02}</math> = stagnation pressure at compressor inlet and outlet
 
<math>T_{01}</math> and <math>T_{02}</math> = stagnation temperature at compressor inlet and outlet
 
<math>R</math> = characteristics gas constant
 
By making use of π-theorem, we obtain the non-dimensional groups (π terms) as <ref name=Yahya />
 
<math>\frac { p_{02} } { p_{01} }\ </math>, <math>\frac { T_{01} } { T_{02} }\ </math>, <math>\frac {{\dot{m}} {\sqrt {RT_{01}}}} {{D^2} {p_{01}} }\ </math>, <math>\frac {{N} {D}} {\sqrt {RT_{01}}}\ </math>
 
When we are concerned with the performance of a machine of fixed size compressing a specified gas and D may be omitted from the groups and we can write
 
<math>F \left( \frac { p_{02} } { p_{01} }\ , \frac { T_{01} } { T_{02} }\ , \frac {{\dot{m}} {\sqrt {T_{01}}}} { p_{01} }\ , \frac { N } {\sqrt {T_{01}}}\ \right) = 0 </math> <ref name=Yahya />
[[File:Fig 2. pressure ratio vs. flow coefficient.jpg|thumb|right|300 px|Figure 1. Pressure ratio vs.Non-dimensional mass flow]]
 
Though the terms <math>\frac {{\dot{m}} {\sqrt {T_{01}}}} { p_{01} }\ </math> and <math>\frac { N } {\sqrt {T_{01}}}\ </math> are truly not dimensionless, they are referred as 'non-dimensional mass flow' and 'non-dimensional rotational speed' for practical purpose.
The stagnation pressure ratio <math>\frac { p_{02} } { p_{01} }\ </math>  is plotted against<math>\frac {{\dot{m}} {\sqrt {T_{01}}}} { p_{01} }\ </math> in the form of family of curves, each curve of a family being drawn for fixed values of  <math>\frac { N } {\sqrt {T_{01}}}\ </math> as shown in Figure 1.
 
==Pressure rise vs. Flow rate<ref name=Yahya />==
 
The plot between pressure rise and flow rate is same as pressure ratio vs. mass flow rate with a small difference as in here we take pressure difference between inlet and outlet of the compressor instead of their ratio.
 
<math>{\Delta p = f(Q)}\ </math>
 
<math>{\Delta p = f(\dot{m})}\ </math>
 
==Loading coefficient/Pressure coefficient vs. Flow coefficient<ref name=Yahya />==
 
First we have to know about the loading, pressure and flow coefficient which are as follow-
 
Loading coefficient<math> ~ </math> <math> {\Psi^\prime} = \frac {{g} {h}} {u^2}\ </math>
 
Pressure coefficient<math> ~ </math> <math> {\Psi} </math> = <math>  \frac {p_{02} - p_{01}} {{\rho} {u^2}}\ </math>
 
So we can see that
 
<math>{\Psi} ~ {\alpha} ~ {\Psi^\prime} </math>
 
Where
 
<math> u </math> = impeller tip speed
 
<math> h </math> = head
 
and also
 
Flow coefficient <math> {\phi} ~ {\alpha} ~ \frac { Q } {{N} {D^3}}\ </math>
 
So assuming a function to relate Loading coefficient and the Flow coefficient
 
<math>{\Psi} = f ({\phi}) </math>
 
A compressor gives its best performance while operating at its design point but it is also expected to operate away from the design point.
Therefore, knowledge about its behavior at off-design operation is also necessary. The quantity <math> (tan \beta_2 + tan \alpha_1) </math> can be assumed constant in a wide range of incidence. This is justified in view of small variations in the air angles at the rotor and stator exits. Therefore, writing
 
[[File:Fig 9 velocity compressor triangle.jpg|thumb|right|400 px|Figure 2. Velocity triangle for compressor Stator and Rotor]]
 
<math> \alpha_1 = \alpha_3 </math>
 
<math> A = tan \beta_2 + tan \alpha_3 </math>
 
Where
 
<math> U </math> = blade peripheral velocity
 
<math> V_1 </math> and <math> V_2 </math> are absolute air velocity at the rotor inlet and outlet
 
<math> V_{r1} </math> and <math> V_{r2} </math> are relative velocity at rotor inlet and outlet
 
<math> V_3 </math> = absolute air velocity at the stator outlet
 
<math> \alpha_1,\alpha_2, \alpha_3, \beta_1 </math> and <math> \beta_2 </math> are the angles shown in the following Figure 2.
 
If the design values are identified by the superscript
 
<math>{\Psi}^{\ast} = 1 - A{\phi}^{\ast} </math>
 
At off-design conditions <ref name=Yahya />
 
<math> {\Psi} = 1 - A{\phi}^{\ast} </math>
 
<math> {\Psi} = 1 -(1- A{\Psi}^{\ast}) </math> <math>\frac {\phi} {{\phi}^{\ast}}\ </math>
 
This equation also gives the off-design characteristic of an axial-flow compressor. The figure shown below depicts theoretical characteristic curves for some values of the constant <math> A </math>. For positive values of <math> A </math>, the curves are falling, while for negative values rising characteristics are obtained.
[[File:Fig 1.Off design characteristic curve of a compressor stage.jpg|thumb|right|200 px|Figure 3.Off design compressor characteristic curve]]
 
===Theoretical characteristic curve===
 
'''Theoretical characteristic curve''' of the compressor is the plot to show behavior
of the fluid without considering losses due to shock and friction<ref name=Ferguson>Ferguson, T.B., The Centrifugal Compressor Stage, Butterworth, London, 1963.</ref><ref name="Whitfield, A. and Wallace, F.J., `Study of incidence loss models in radial and mixed flow turbomachinery`">Whitfield, A. and Wallace, F.J., `Study of incidence loss models in radial and mixed flow turbomachinery`, Instn. Mech. Engrs. Conference Publication, 3, paper No. C55/73, 1973.</ref> as it passes through
the compressor at different constant speeds. The curve as shown in Figure 4. is plotted between
pressure coefficient <math> {\Psi} </math> and flow coefficient <math> {\phi} </math>
for different values of <math> A </math> as shown in fig. From fig. Its clear that as
the flow coefficient <math> {\phi} </math> increases the pressure gained
per unit mass flow rate of the fluid decreases and due to this
pressure coefficient <math> {\Psi} </math> at higher mass flow rate will be low.
 
[[File:Fig 4. actual characteristic curve of compressor.jpg|thumb|right|200 px|Figure 4. Actual compressor characteristic curve]]
 
===Actual characteristic curve<ref name="Watanabi, I. and Sakai, T.">Watanabi, I. and Sakai, T., `Effect of the cone angle of the impeller hub of the mixed flow compressor upon performance characteristics`, SAE paper No. 996A, 1965.</ref><ref name="Whitfield, A. and Wallace, F.J., `Performance prediction for automotive turbocharger compressors`">Whitfield, A. and Wallace, F.J., `Performance prediction for automotive turbocharger compressors`, Proc. Instn. Mech. Engrs. 1975.</ref>===
 
'''Actual characteristic curve''' of the compressor is the modified version of the theoretical characteristic curve. In this we take care of both shock and friction losses as shown in the Figure 5. As seen in the figure the steepness of the curve increases at higher mass flow rates because since there will be higher frictional losses at high flow coefficient (Darcy’s friction law).
 
==Surging<ref name=Greitzer>Greitzer, E.M., `Surge and rotating stall in axial flow compressors`, ASME  J. Eng. Power,  Vol. 98. No. 2, April 1967.</ref><ref name=Tsui>Tsui, Chih-Ya et al., ` An experiment to improve the surge margin by use of cascade with splitter blades`, J. Eng. Thermophys,, Vol. 1, no. 2, May 1980.</ref>==
[[File:Fig. 5. surging.jpg|thumb|right|300 px|Figure 5. Surging]]
 
'''Surging''' is the complete breakdown of steady flow in the compressor which occurs at low flow rate. Surging takes place when compressor is operated off the design point and it affects the whole machine and this is aerodynamically and mechanically undesirable. It can damage the rotor bearings, rotor seals, compressor driver and affect the whole cycle operation. It results in high temperature, high vibration and leads to flow reversal.<ref name=Yahya />
 
===Surge process===
 
Assuming the compressor operates at point A (<math> p_A, {\dot{m}}_A </math>) on the characteristic curve (let at constant speed <math> N_4 </math>) as shown in Figure 5. Now if the flow rate is reduced to <math> {\dot{m}}B </math> by closing a control valve on the delivery pipe, the static pressure upstream of the valve is increased. This increased pressure (<math> p_B </math>) is then matched by the increased delivery pressure (at B) which is developed by the compressor. Now further reducing the flow (to <math> {\dot{m}}_C </math> and <math> {\dot{m}}_S </math>), the increased pressures in the delivery pipe are again matched by the compressor delivery pressures at C and S on the characteristic curve.
 
On the characteristic curve at the flow rates below ṁS provides lower pressure as seen in the fig. at D and E. But now the pipe pressures due to further reduction of flow by valve (let at point D) will be higher than the pressure at D and E. This unbalance between the pipe pressure and the compressor delivery pressure only exist for a very short time. This is because there is higher pressure in the pipe than the air pressure produced by the compressor and due to this reversing of the flow takes place and it leads to a complete break-down of the normal steady flow from the compressor to the pipe.
 
===Surge cycle===
 
Due to flow reversal, pressure in the pipe falls and the compressor regains its normal stable operation (let at point B) delivering the air at higher flow rate (<math> {\dot{m}}_B </math>). But the control valve is still corresponds to the flow rate <math> {\dot{m}}_D </math>. Due to this compressor’s operating conditions will again return to D through points C and S. And due to lower compressor pressure, the pressure falls further to <math> p_E </math> and the entire phenomenon from point E to D repeats again and again and this cycle EBCSDE known as the '''surge cycle'''.
 
===Surge point===
 
'''Surge points''' are the peak points on the characteristic curves (as in Figure 5.) left of which the pressure generated by the compressor is less than the pipe pressure and these points initiates the surge cycle. These points on the curves are shown in the fig. by point S.<ref name=Yahya />
 
===Surge line===
 
'''Surge line''' is the line which connects the surge points (S) on each characteristic curve corresponding to different constant speeds. The stable range of operation for the compressor is on the right hand side of the surge line.
 
===Surge control line===
 
'''Surge control line''' is the line which works as the indicating line for the surge control mechanism so that surge can be prevented in the system and proper steps can be taken. The line can vary for different surge control systems as its up to the system to decide the margin between operating point and the surge point.
<ref name=http://www.gmrc.org/documents>http://www.gmrc.org/documents/GMRCSurgeGuideline_000.pdf</ref>
 
===Surge margin===
 
'''Surge margin''' is the indicator to show that how close is the system to the surge. It is different for the different surge control system as they employ different surge control lines.<ref name=Cumpsty>Cumpsty, N. A. (1989). Compressor Aerodynamics. Longman.</ref> The basic surge margin can be defined as
 
Surge margin  = <math> \frac {{\dot{m}_O} - {\dot{m}_S}} {\dot{m}_O}\ </math>
 
Where
 
<math> {\dot{m}_O} </math> = mass flow rate at surge control line at a particular constant speed
 
<math> {\dot{m}_S} </math> = mass flow rate at surge line at the same constant speed.
 
==Stalling==
 
[[File:Fig. 6 stalling.jpg|thumb|right|300 px|Figure 6. Stalling process]]
 
'''Stalling''' is the separation of flow from the compressor blade surface as shown in the Figure 6. At low flow rates the incidence angle or angle of attack increases and due to this there occurs the flow separation on the suction side of the blades which is known as positive stalling. If the flow separation occurs on the pressure side of the blade then it’s known as negative stalling and this occurs due to negative incidence angle. But generally positive stalling is taken into consideration. 
 
In the compressor at high pressure stages if there occurs a deviation from design point (at which compressor is designed to operate) the angle of attack exceeds its stalling value and stall cells (which are the regions where fluid starts to whirl at a particular location and don’t moves forward) to form at hub and tip of the blade. The size of these cells increases with decreasing flow rate. If the flow rate is further reduced these cells grow larger and it affects the whole blade height and this causes significant drop in the delivery pressure and at very low flow rate, flow reversal takes place which is known as surge. It also results in drop in stage efficiency of the compressor and its delivery pressure.<ref name="Howell, A. R. (1942). The present basis of axial flow compressor design: Part 1">Howell, A. R. (1942). The present basis of axial flow compressor design: Part 1, Cascade theory and performance. ARC R and M. 2095.</ref>
 
== Other compressor phenomena==
 
Following are some other characteristics  of the compressor
 
===Choke/Stone wall point===
 
Choking is the condition which occurs in the compressor in which it operates at very high mass flow rate and flow through the compressor can’t be further increased as mach number at some part of the compressor reach to unity i.e to sonic velocity and the flow is said to be choked. In compressor maximum volume flow rate is limited by cross-section at the inlet. This condition can be seen in the right side of the Figure 5. in which constant speed lines descends steeply. The point on constant speed line at which choking occurs is known as '''choke point''' or '''stone wall point'''.
<ref name=http://www.turbodriven.com/en/turbofacts>http://www.turbodriven.com/en/turbofacts/designCompressor.aspx</ref>
 
===Choke line===
 
'''Choke line ''' is the line joining the choke points on different constant speed lines in the Figure 5. The operation on right side of choke line is not possible.
 
===Constant efficiency lines===
 
'''Constant efficiency lines''' are the elliptical shaped curves in the compressor characteristic curve along which the efficiency of the compressor remains constant.
 
===Maximum allowable speed===
 
This is the maximum speed at which compressor can work properly(shown as <math> N_4 </math> in Figure 5.) and beyond this speed limit stresses and vibrations in the compressor crosses the prescribed limit and this can damage the compressor and to control this, compressor's speed is lowered.
 
===Minimum required speed===
 
This is the minimum speed at which compressor should operate (shown as <math> N_0 </math> in Figure 5.) and below this limit compressor can't increase the pressure of inlet fluid and goes into idle condition.
 
==References==
{{reflist}}
 
[[Category:Compressors]]

Latest revision as of 16:08, 25 November 2014

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