The recuperators have high air resistance , low air preheating temperature and high fanpressure head , and fan has much noise to environment and are apt to break down with vibration .
此换热器空气阻力大，空气预热温度不高，风机压头高，环境噪声大，风机振动大、易损坏。
2
A new structure fan with small size, high pressure and low flow-rate is designed to meet the demands of industry.
为满足工业领域对高压比、低流量风机的需求，设计了一种新型结构的小尺寸、高压比、低流量风机。
3
The stall surging characteristic and its prevention measure are analysed with focus on low-pressure axial fan, high-pressure axial fan and mutiple-stage axial compressor.