How the axial velocity affect the compressor performance?
In a multi-stage compressor, at the high pressure stages, axial velocity is very small. Stalling value decreases with a small deviation from the design point causing stall near the hub and tip regions whose size increases with decreasing flow rates.
What is the speed of axial flow compressor?
Axial-flow compressors have a volumetric flow rate range of approximately 104–106 actual cfm (4.7 × 105 to 4.7 × 105 actual liters/sec). Their compression ratios are typically around 10–20. Because of their small diameter, these machines are the principal compressor design for jet engine applications.
What improves the performance of axial compressors?
End-sweeps can effectively improve the performance of axial compressors [36], [37], [38]. Benini and Biollo [32] showed that the use of swept blades effectively reduced shock losses and improved the aerodynamic behavior of the transonic rotors.
What is axial flow velocity?
The axial velocity distribution of pipe flows can be described by a constant velocity superimposed by a term that takes into account the influence of swirl on the flow [7]. The discrepancy of the measured and calculated axial velocity is larger than for the circumferential velocity.
What is the working principle of axial flow compressor?
The basic working principle behind an axial flow compressor is that the rotor imparts kinetic energy to the gas. This kinetic energy is later converted to static pressure when it is diffused through passages or when it strikes on the rotor. For an axial flow compressor, the flow of gases is along the axis.
Does compressor increase velocity?
As gas passes through the compressor, its velocity is alternately increased and decreased. During each increase in velocity the kinetic energy of the gas is increased, and during each decrease in velocity this kinetic energy is converted into an increase in pressure.
What are the factors that affect the performance of axial flow compressor?
Axial compressor performance is a function of various parameters including casing diameter, hub-casing ratio, blade number, chord lengths, blade angles and form, radial tip clearance, rotational speed and mass flow.
What is the meaning of axial flow?
: having the fluid or gas flowing parallel to the axis axial-flow turbine axial-flow pump — compare radial-flow.
What is radial and axial flow?
“Axial” refers to the direction of flow produced by the impeller. Similar to the axial flow turbine, the term “radial” describes the flow of liquid resulting from the impeller. The radial turbine blades are welded to the hub with the blade surfaces parallel to the shaft.
What are the advantages of axial flow compressor?
Advantages of the axial compressor are its higher flow rate and greater pressure ratio, which results in higher thrust and fuel efficiency. This makes it better suited to applications where the thrust of the engine itself is the motive force for the aircraft.
What are the components of an axial flow compressor?
The basic components of an axial flow compressor are a rotor and stator, the former carrying the moving blades and the latter the stationary rows of blades.
What are the performance characteristics of an axial flow compressor?
Performance Characteristics of Axial Flow Compressors: It is seen that, for a given value of N/√T o1, these curves cover a much narrow range of mass flow rate as compared with those for centrifugal compressors. Also at higher rotational speeds, the curves become steep, nearly vertical.
How does the velocity triangle work in an axial flow compressor?
Velocity Triangle of Axial Flow Compressors: In the axial flow compressor, fluid is imparted with kinetic energy from the rotor. This kinetic energy of the fluid is converted into pressure energy by diffuser action. The process occurs over several stages.
How is the performance of a centrifugal compressor determined?
The performance of centrifugal compressors is specified by illustrating the variation of delivery pressure and temperature with mass flow rate for various speeds. However, these characteristics are further influenced by other variables like inlet pressure and temperature.
What is the characteristic of a Dynamic compressor?
Compressor characteristic is the curve to show the behaviour of fluid, like change in pressure, temperature, entropy, flow rate etc. as it passes through a Dynamic compressor at different compressor speeds.
