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在利用激光干涉法测量定容燃烧弹燃烧室狭缝间隙内未燃混合气热力状态参数的基础上，分析了不同狭缝间隙宽度下狭缝内未燃混合气双壁激冷厚度的变化规律，定量地计算了狭缝容积内未燃碳氢（ＵＨＣ）的生成量。结果表明，狭缝间隙处未燃混合气的双壁激冷厚度不仅与狭缝宽度有关，也与未燃混合气在狭缝内所处的位置有关，理论计算和实验结果表明，存在一临界狭缝宽度，超出这一宽度将有助于火焰在其内部的传播，从而降低ＵＨＣ在缸内的生成量，在本实验的条件下，在火焰传播到狭缝入口处时，入口处双壁激冷临界厚度为０．５ｍｍ，这与作者根据纹影拍照得到的结果相符。实验结果也表明，火焰传播到狭缝入口处时，狭缝内ＵＨＣ量将增加到燃烧开始时的４倍左右。
Based on the laser interferometry method to measure the thermal state parameters of unburned mixture in the slit space of a constant volume combustion cartridge, the variation of double wall chilled thickness of unburned mixture gas in a slit with different slit gap widths was analyzed , The amount of unburned hydrocarbon (UHC) in the slit volume was quantitatively calculated. The results show that the thickness of uncooled mixed gas at the slit gap is related not only to the width of the slit but also to the location of the unburned mixture in the slit. Theoretical calculations and experimental results show that there is a critical Slit width, beyond this width will help the propagation of the flame in its interior, thereby reducing the amount of UHC generated in the cylinder, in the experimental conditions, the flame spread to the slit entrance, the entrance to the double wall The critical thickness of the chill is 0.5 mm, which is consistent with the author’s photograph taken according to the schlieren. The experimental results also show that when the flame propagates to the entrance of the slit, the amount of UHC in the slit will increase to about 4 times of that at the beginning of combustion.