Experiment on the fuel active cooling of multi-working combustion chamber
When the hypersonic vehicle jumps between different Mach numbers and altitudes,the com-bustion chamber works intermittently under different working conditions,and the thermal load changes al-ternately.In order to ensure the normal operation of the combustion chamber structure,fuel active cool-ing is used to protect the combustion chamber.In order to verify whether the combustion chamber coke and deposition of carbon during the active cooling of the fuel affect its normal work,a multi-worked com-bustion chamber fuel active cooling simulation test device is designed.The device adopts the method of e-lectric heating to simulate the alternating heat load generated by high-temperature incoming flow,and the active cooling combustion chamber simulation test part is tested and assessed in the hot-wall-cold-oil,hot-wall-hot-oil and fuel-non-flow state.The results show that the thermal structure of the active cooling com-bustion chamber passes through the hot-wall-cold-oil more than 3 times.After the hot-wall-hot-oil cycle test,the specimen has not been damaged.With the increase of the number of cycles,the flow resistance of the specimen is relatively small,and the pressure difference of the hot-wall-hot-oil condition is higher than that of the hot-wall-cold-oil conditions.The specimen is examined,and it is found that the carbon deposition in the cooling channel is not obvious,and the carbon deposition mainly appears in the collector cavity of the fuel outlet.
万方数据
维普
