Empirical and Numerical Study of Solidity Effects on Pressure Coefficient and Velocity Distribution of Axial Compressor Blades

Abstract

In the present research, the axial compressor blade’s cascade was analyzed in terms of numerical and experimental conditions. The model
included three rotor blades of an axial compressor with the same geometry and profile of NGTE 10C4/30C5 and parallel to the ratio of solidity
values, e.g. 1.2 and 0.8, have been studied. The experiments were done in a subsonic wind tunnel and, before it, the reforms in the output of a wind
tunnel to install a new test section, suitable for cascade testing, were designed and then built. The necessary measures also for the possibility of a
hot-wire probe crossing from the wind tunnel wall and its moving on the surface of the blades has been adopted. The suction and pressure surfaces
of the test blade have been equipped to the suitable tapping of the pressure to be connected through the connector tubes to the pressure transducers.
The suction and pressure surface velocity profiles in different longitudinal situations and distribution of surface pressure were measured. Parallel
with the experiments, the numerical analysis of current also for different modes has been performed and the results compared. In a total sum can be
said: by increasing the solidity, namely reducing the blades distance, the pressure reduces and the velocity will increase. According to the continuity
equation can be said with increasing the solidity the input and output area ratio decreased and considering to the reverse relation of the area ratio
with velocity, the velocity increases