目前,节流孔的音速流导计算一般只考虑与节流孔直径和长度的关系,没考虑节流孔挡板间隙.该文面向工程需要,针对气动带挡板节流孔音速流导计算问题,建立理论解析的数学模型,在Simulink中构建模型对音速流导进行计算,将计算得到的临界压力比数据,通过拟合的方式得到临界压力比计算式,进而得到带挡板节流孔的音速流导计算式.结合实验,确定音速流导计算式中的参数,将计算式简化成能在工程中使用的简易计算式;利用Fluent对带挡板节流孔模型进行仿真,通过仿真数据确定计算式的有效性与使用范围.%When sonic conductance of orifices is calculated, the diameter and length of the orifice are generally taken into accountbut the gap between the orifice and baffle at present. In this paper, based on the engineering needs, the mathematical model of the theoretical analy-sis and calculation model in Simulink is established for the calculation of the sonic conductance of pneumatic orifice with baffle.Based on the data of critical pressure ratio obtained by Simulink,a formula for calculating the critical pressure ratio is proposed. Then a formula for calculating the sonic conductance of orifice with baffle is proposed.The parameters in the calculation formula can be determined by the com-bination of experiment data. Therefor the formula can be simplified. The effectiveness and scope of the formula is verified by Fluent simula-tion data.
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