Abstract The paper describes a method for optical measurement of oscillation blades in linear cascade designed flutter research. uses laser triangulation, which measures the distance between sensor and object. can be recalculated to angular displacement blade. However, relation is nonlinear due curvature dependence derived quantified analytically. further analyzes influence light refraction win...

Estimation of starting torque is very important for motor design and for improvement in compressor efficiency. Especially, when compressors are restarted after a period of inoperation, motors sometimes meet large starting torque. The assumed reasons are as follow . The compressors temperature is sometimes lower than any other parts of the refrigerant cycle. In this case, the refrigerant tends t...

A low specific speed centrifugal compressor with leading/trailing edge combined sweep blades is proposed. The performance and internal flow field characteristics are analyzed in detail by numerical simulations, a bench test carried out. It shown that using the swept blade, stage pressure ratio of improved under all operating conditions, maximum increase can reach 6.5%. efficiency be markedly at...

A gas or vapor compressor is one of the key components of many engineering systems, such as certain designs of vapor compression refrigeration systems, cryo-coolers, air handlers. For meso-scale systems with linear dimensions of a few centimeters, conventional designs do not work efficiently because of rather large relative tolerances, and hence these meso-scale systems require micro-fabricated...

Serving as a key component of the core engine, high-load axial compressor is expected to have high performance, which determines several critical parameter levels aero-engine. The unsteady effect on performance induced by interaction among different rotors should not be ignored during design compressor. between R1 (the first rotor row) and R2 second transonic was measured in detail using high-f...