A study of speed ratio affecting the performance of a contra-rotating axial compressor

Abstract

The performance and detailed flow structure of a counter-rotating compressor under different rotating speed and typical working condition were experimentally and numerically investigated. Numerical results preliminarily showed that the total pressure ratio performance agreed well with experimental data, when the calculated peak efficiency was a little bigger than the experimental one. With optimized speed ratio, the peak isentropic efficiency can be increased with minor reduction of the total pressure ratio and safe margin. Flow reversal fist occurred at the start section of the outlet guide vane and it covered nearly 40 per cent area of the whole flow at the stall point when the rotational speed ratio of rotor 1 and rotor 2 were greater than or equal to 1, and it caused the compressor operate in the stall point. First, however, the flow separation and great range low-energy flow occurred at the 30 per cent span range of s rotor blade-tip near stall point, which was the main reason for the compressor stall when the speed ratio is less than 1. Rotor 2 worked at a greater incidence angle because of the separation at the trailing edge of rotor 1.

Numerical simulation of unsteady aerodynamic interactions of contra-rotating axial fan

“…Nouri [ 6 ] carried out an experimental study on the design of the contra-rotating fan, revealed that speed ratio had an important impact on the overall performance. Chen [ 7 ] investigated the effects of speed ratio and rotation speed of rotor upstream over downstream on the performance of a contra-rotating compressor. The aerodynamic performance and noise of a contra-rotating fan under different rotation speed and axial spacing were numerically investigated by Luan [ 8 , 9 ].…”

Thermodynamic potential of using a counter rotating novel axial impeller to compress water vapor as refrigerant

“…A counter rotating strategy is used to increase pressure ratio and decrease configuration's size since stator vane become unnecessary. Because of this, the counter rotating technique has been studied in aviation primarily for the compression of air (Chen et al, 2008;Young, 1951). In this study, instead of simulating the whole multi-stage compressor, CFD numerical methods are used to predict one single counter rotating stage's performance.…”

Investigation of Speed Matching Affecting Contrarotating Fan’s Performance Using Wireless Sensor Network including Big Data and Numerical Simulation

“…However, in the actual work of CRF, the rear-stage rotor motor burnt out by accident [15]. Experimental studies showed that variable speed matching can improve the work stability [16]. Mistry and Pradeep [17,18], through experiments and numerical simulations, reported a study of speed ratio on the performance of a contrarotating fan stage.…”