基于气液加载方式的机匣热内压试验方法

提出了一种基于气液加载方式的航空发动机机匣热内压试验方法，用于模拟机匣件在典型工况下的温度和内压联合加载考核。采用气液加压装置实现温度和压力加载介质的解耦，以高温耐压油作为温度加载介质，利用仿形电加热器实现热载荷施加，以高压稳定气源作为压力载荷源对气液压控制腔体加压，通过对加压模型的理论分析指导压力载荷的定量控制。验证表明试验方法能够有效实现温度和压力载荷的精确控制，解决了液压系统难以实现高温控制和气压系统温度控制均匀性差的问题，同时也有效避免了气压加载方式开展破坏试验时的爆破现象。基于气液加压方式的试验方法能够有效应用于机匣件的热内压考核，实现温度控制精度优于±3 K和压力加载过程定量控制。

Thermal internal pressure test method of casing based on gas-liquid loading

A thermal internal pressure test method based on gas-liquid loading was designed for the load-bearing test of aero-engine casing under temperature and internal pressure load. The gas-liquid loading device can decouple temperature and pressure loading. This device used high-temperature oil as the heating medium to heat up aero-engine casing through an electric heater with the same shape as the aero-engine casing. The pressure loading system used a high-pressure air source to pressurize the cavity of the device to achieve internal pressure loading on aero-engine casing. Quantitative control of pressure load was guided by theoretical analysis of pressure model. Tests showed that the method can effectively control the temperature and pressure loading accurately. While avoiding the difficulty of using hydraulic loading method to achieve high temperature loading, this method solved the problem of poor temperature uniformity in the test using air-pressure loading method. This method also effectively avoided the blasting phenomenon if the air-pressure loading method applied to the destruction test. Results showed that the test method based on the gas-liquid loading method can be effectively applied to the thermal internal pressure test of aero-engine casing. The control accuracy of temperature load was better than ±3 K. The pressure loading process can be quantitatively controlled.