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采用气液耦合振动是降低热声发动机谐振频率和提升其压力振幅的一种有效途径。为了研究液体工质对于气液热声发动机性能的影响,本文针对水、室温离子液体[EMIM][BF_4]、20%氯化钾溶液、40%和50%甲酸钾溶液五种液体工质进行了实验研究和分析。实验数据显示,在相同加热功率下,采用50%甲酸钾溶液时系统谐振频率最低,而水工质对应的谐振频率最高;40%甲酸钾溶液的压力振幅最大,而采用离子液体[EMIM][BF4]时系统压力振幅最小。研究结果表明:采用密度较大的液体工质可获得较低的谐振频率,而密度大、黏度小的液体工质则有利于获得更大的压力振幅。
The use of gas-liquid coupled vibration is an effective way to reduce the resonant frequency of the thermoacoustic engine and increase its pressure amplitude. In order to study the effect of liquid working medium on the performance of a gas-liquid thermoacoustic engine, five liquid working fluids, water, room temperature ionic liquid [EMIM] [BF 4], 20% potassium chloride solution, 40% and 50% potassium formate solution Experimental research and analysis. The experimental data shows that at the same heating power, the system resonant frequency is the lowest when 50% potassium formate solution is used, while the corresponding resonant frequency is the highest for 40% potassium formate solution, while the ionic liquid [EMIM] BF4] system pressure amplitude minimum. The results show that the lower resonant frequency can be obtained by using the liquid with higher density, whereas the higher density and less viscous liquid working medium is more conducive to obtaining larger pressure amplitude.