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与直喷式燃烧过程相比,预燃室式燃烧过程的优点是在相同的功率下其最大爆发压力约低25～30％。法国热机研究所研制的皮尔斯蒂克PA4—200型发动机采用变截面的特种预燃室来解决预燃室发动机比油耗高的缺点。该机原为直喷式,由于采用了特种预燃室,使其最大爆发压力由140巴降为95巴。 通过采用二级增压来提高增压压力及加大油泵供油量来发挥其功率储备。这样在同样的机械负荷下功率可增加40％,同时,燃烧过量空气的增加使热负荷不变. 关于变截面预燃室已在参考文献[1]报导,这里仅谈谈使用高增压的一些经验。
The advantage of a pre-combustion chamber combustion process compared to direct injection combustion is that its maximum burst pressure is about 25-30% lower at the same power. French Institute of Thermal Engineers developed Pierce PA4-200 engine with a special cross-section of the pre-combustion chamber to solve the pre-combustion chamber engine fuel consumption than the shortcomings. The aircraft was originally direct injection, due to the use of special pre-combustion chamber, so that the maximum burst pressure dropped from 140 bar to 95 bar. Through the use of two booster to increase the boost pressure and increase the pump fuel supply to play its power reserve. This increases the power by 40% at the same mechanical load, and at the same time, the increase of the combustion excess air keeps the heat load unchanged.As for the variable section pre-chamber, it has been reported in reference [1] that only talk about the use of high-pressure Some experience