Effects of low frequency pulse of gas inlet flowrate on combustion stability
The change of external operating factors leads to unstable combustion,and combustion chamber structure can be destroyed in severe cases.The non-premixed combustion flame was taken as the object under the condition that the equivalence ratio of methane to air was 1,and the dynamic pressure sensor and grating spectrometer were used to measure the changes of pressure and heat release rate.The effects of low-frequency pulse of gas inletflow rate(1.000～5.000 Hz)on combustion stability were analyzed experimentally.Results show that the inletflow pulse affects the combustion stability.The flame shape,combustion chamber pressure(p)and heat release rate(qi)fluctuate periodically at the same frequency.The pulse frequency has the greatest influence on weakening combustion stability in the range of 2.000～2.500 Hz,when p andqihave high pulse amplitude.However,1.000 Hz pulse frequency has the least effect on weakening combustion stability.The influence of pulse frequency on weakening combustion stability gradually changes from linear to nonlinear with the increase of frequency.It suggests the greater the proportion of pulse flowrate is,the greater the amplitude of p and qi is,with the combustion tending to unstable combustion.
gas jetpulse flowratenon-premixed combustiontime frequency characteristicscombustion stability
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NSTL
万方数据
维普
