结构及运行参数对内混喷嘴压力的影响研究

在内混式介质雾化喷嘴的设计计算中，通常近似将混合室内压力与雾化介质进口压力之比看作为临界压比，这种近似与实验结果有较大差别。实验研究结果表明，内混式喷嘴混合室内压力并不等于雾化介质进口压力与临界压比之积，而与喷嘴的结构特性及运行参数密切相关。本文以压缩空气和变压器油为工质对内混式介质雾化喷嘴混合室内压力特性进行了实验研究，获得了该类喷嘴混合室内压力与结构及运行参数间的实验关系式（1）、式（2），可供工程设计及运行参考。

Experimental Study of the Influence of Structural and Operating Parameters on the Pressure of an Internal-mixing Nozzle

In the design calculations of a media-atomization nozzle of internal mixing type it is common practice to regard the ratio between the pressure in a mixing chamber and the inlet pressure of atomization media as approximately a critical pressure ratio.Such an approximation will give rise to a relatively great difference with respect to the results of experiments.The results of an experimental study indicate that the pressure in the mixing chamber of the internal mixing type nozzle is not equal to the product of atomization-media inlet pressure and the critical pressure ratio,but has been closely related to the structural features and operating parameters of the nozzle.With compressed air and transformer oil serving as working media an experimental study was conducted of the pressure characteristics in the mixing chamber of the media-atomization nozzle of an internal mixing type.As a result,an experimental relation was obtained between the pressure in the mixing chamber on one hand and the structural and operating parameters on the other hand for this kind of nozzle.This relation can serve as a reference for design and operation engineers.