热稳定性是由3级风扇的噪音非常低的水平。

Thermal stability is provided by a 3-stage fan with a very low noise level.

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本文首先介绍了风扇的工作原理，包括基元级的速度三角形、叶型和叶栅参数以及叶栅的空气动力学方程。

This paper explains the working principles of a fan, including velocities on an elementary stage, parameters of blade types and cascades and the aerodynamics formulas of cascades.

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采用新建立的试车台数据实时采集与监控系统，测量了该单级跨声速风扇的总性能和采用处理机匣后风扇的总性能、基元级性能。

By using real time data gathering and test system of the aero engine test bed, the detail measurement of single stage transonic fan performance with and without different casing treatments were made.

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