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在试油测试期间,燃烧器喷射和燃烧产生的噪声会对人员和坏境造成较大的危害,故有必要对燃烧过程中噪声预测展开研究,其结果对于评估平台燃烧噪声危害、优化作业设计及进一步采取降噪措施有重要意义。结合测试燃烧器实际情况提出相应声学计算模式。基于经典燃烧噪声理论及流体动力学噪声的Lighthill理论,通过相似准则的量纲分析方法推导出喷射及燃烧噪声计算公式,并通过声波叠加原理得到声源噪声。同时考虑指向性、扩散衰减、空气吸收、水喷淋消音等减噪因素建立测试燃烧器的噪声计算模型。结合测试燃烧器高压喷射的湍流及多相流特点开展CFD数值模拟计算,数值模拟计算噪声声压级结果与噪音模型计算结果吻合较好。通过该噪声模型计算结果与现场实测数据及某西方公司软件计算结果比较,表明该计算模型可以较好的应用于测试燃烧器噪声预测。
It is necessary to study the noise prediction in the combustion process during the test oil test, the noise generated by the injection and combustion of the burner will cause great harm to the personnel and the environment. The results are helpful to evaluate the harm of the platform combustion noise and optimize the work design And further measures to reduce noise are of great significance. Combined with the actual situation of the test burner proposed acoustic calculation mode. Based on the classical theory of combustion noise and the Lighthill theory of hydrodynamic noise, the calculation formula of injection and combustion noise is deduced by the method of dimensional analysis of similarity criterion. The noise source is obtained by the principle of acoustic superposition. At the same time, considering the directivity, diffusion attenuation, air absorption, water spray noise reduction and other noise factors to establish a test burner noise calculation model. Combining the characteristics of turbulent flow and multiphase flow in high pressure jet test, CFD numerical simulation is carried out. The results of numerical simulation are in good agreement with the noise model. Comparing the result of the noise model with the measured data from the field and the calculation result of a Western company shows that the calculation model can be applied to the prediction of burner noise better.