关键词: 预旋系统;预旋喷嘴;温降;流量系数;预旋效率 

Abstract: Both simple drilled hole and the aerodynamic hole with pre-swirl angle of 20° were numerically simulated and measured. The computational models include standalone model which contains only the inlet chamber, pre-swirl hole and exit chamber, and system model which contains rotating parts on the basis of standalone model. The investigated parameters are velocity contour, outlet velocity, velocity angle, discharge coefficient and pre-swirl effectiveness,repectively. The discharge coefficient of standalone model was measured. Results show that the measured and calculated discharge coefficient coincide well, and the discharge coefficient, pre-swirl effectiveness and temperature drop of the aerodynamic hole are increased by more than 20%, compared with that of the simple drilled hole. Data also reveal that the discharge coefficient and pre-swirl effectiveness obtained from the standalone model are close to that from the system model, and the temperature drop predicted via the pre-swirl effectiveness of standalone model can reveal the temperature drop characteristics of pre-swirl system indirectly. 

Key words: Pre-swirl system; Pre-swirl nozzle; Temperature drop; Discharge coefficient; Pre-swirl effectiveness