Measurement of flow parameters in a scramjet combustor based on near-infrared absorption
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摘要: 基于可调谐二极管激光器吸收光谱技术, 利用7185.597cm^{-1}, 7444.35cm^{-1} + 7444.37cm^{-1}(重合吸收线)两条H_2O吸收线, 采用分时扫描-直接探测策略组建多光路吸收测量系统, 在4kHz的测量频率下, 定量测量了燃烧室气流的静温、水蒸气浓度和流向速度. 利用位移机构, 在以C_2H_4为燃料的超燃直连式试验台中, 在单次试验中同时诊断燃烧室内某截面和燃烧室出口的多气流参数的截面分布. 利用燃烧室出口截面的水蒸气浓度分布, 并结合壁面静压计算燃烧效率; 利用燃烧室出口截面的静温和速度分布, 获得出口气流马赫数分布; 利用凹腔后部某截面的温度和水蒸气浓度分布, 判读了凹腔附近流场特征.
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关键词:
- 燃烧效率
Abstract: A multi-channel tunable diode laser absorptionspectroscopy (TDLAS) system was constructed to measure flow parameters in adirect-connected scramjet test facility fueled with ethylene. Two fiberscoupled distributed feedback (DFB) lasers with narrow line width were usedto probe two H_{2}O absorption featuresby using direct absorptiontime-division-multiplexing (TDM) strategy at a 4kHz scan rate. Flowparameters were measured, which included the distribution of temperature,water vapor concentration and velocity at the exit cross section of thecombustor, the distribution of temperature and water vapor concentration inthe cross section near the cavity. Combustion efficiency was obtained byusing the water vapor partial pressure distribution and the wall staticpressure. Mach number distribution was deduced from the temperature andvelocity parameters distributions at the exit cross section of thecombustor, and the distributions of temperature and water vaporconcentration in the cross section near the cavity were used to analyzecombustion characteristics in the combustor.-
Key words:
- combustion efficiency
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