Objective To propose the design scheme of pressure balanced equipment for the pressure balanced system of engine start tests in environmental laboratory, study the effect of pressure balanced equipment on climate test chamber pressure and optimize the design solution. Methods Pressure movement of climate test chamber under different structures was obtained through co-simulation of CFD and dynamics based on FLUENT and ADAMS. Results The climate test chamber pressure was affected by dynamic characteristics of pressure balanced equipment decided by its structure and force on pressure balanced equipment. Conclusion Change in flow field was clearly described by the co-simulation results. Reasonable design solution of pressure balanced equipment could ensure the chamber pressure in a regulated range, and the design solution proposed in this paper could meet the needs.%目的：提出针对环境实验室发动机地面开车试验压力平衡系统的压力平衡窗设计方案，研究压力平衡窗对于室内压力的作用情况，并验证优化设计方案。方法基于FLUENT及ADAMS技术，通过动力学及流体力学联合仿真分析得到不同结构作用下的流场变化情况。结果压力平衡窗窗体结构形式决定其动力学特性，压力平衡窗的动力学特性与其受力耦合作用影响环境实验室压力。结论联合仿真模拟结果可以清晰地描述流场变化情况，合理设计压力平衡窗可以有效地保证实验室内压力在规定范围内，所设计的压力平衡窗能够满足设计要求。
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