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首页> 外文期刊>Journal of Mechanical Science and Technology >Lean combustion by a pre-chamber charge stratification in a stationary spark ignited engine
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Lean combustion by a pre-chamber charge stratification in a stationary spark ignited engine

机译：固定式火花点火发动机通过预燃室分层实现稀薄燃烧

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Combustion a lean air-fuel mixture in a spark ignited (SI) engine is one way to reduce nitrogen oxide (NOx) emissions that results in an increase of engine efficiency by decreasing a peak combustion temperature. An effective concept to lean mixture combustion can be a two-stage combustion system of stratified burn mixture in the engine with pre-chamber, in which combustion starts in a pre-chamber (1 stage) and, further, the flame jet from a pre-chamber initiate lean mixture combustion in the engine cylinder (2 stage). The paper presents the results of the laboratory research of the SI stationary engine with two-stage combustion system powered by LPG gas. The results were compared to the results of the dual-fuel engine with two-stage combustion system and the conventional engine with one-stage combustion process. Air-fuel mixture stratification method in the test engine, by using two-stage combustion system with pre-chamber, allowed burning of lean mixture with the overall excess air ratio (lambda) up to 2.0, and thus led to lower emissions of nitrogen oxides in the exhaust gases of the engine. The test engine implementing a conventional, single-stage combustion process has allowed a correct burning of air-fuel mixtures of excess air ratio not exceeding 1.5. Of the value lambda > 1.5, an increase of coefficient of variation indicated mean effective pressure (COVIMEP), and it decreased the engine thermal efficiency (ITE), which became virtually impossible to operate. The engine implementing a two-stage combustion process, working with lambda = 2.0 allowed to reduce the NOx content in exhaust gases to a level of about 0.02 g/kWh (for gas engine) and 1.15 g/kWh (for dual-fuel engine). These values are significantly less than the values obtained in the conventional engine, which indicated thermal efficiency (34%) characterized by the emission of NOx -26.25 g/kWh.
机译：在火花点火（SI）发动机中燃烧稀薄的空气燃料混合物是减少氮氧化物（NOx）排放的一种方法，该方法通过降低峰值燃烧温度来提高发动机效率。稀薄混合气燃烧的有效概念可以是带有预燃室的发动机中分层燃烧混合物的两级燃烧系统，其中燃烧在预燃室（1级）中开始，并且进一步从预燃室进行火焰喷射-室启动发动机气缸内的稀薄混合气燃烧（2级）。本文介绍了由LPG气体驱动的具有两级燃烧系统的SI固定式发动机的实验室研究结果。将结果与具有两级燃烧系统的双燃料发动机和具有一级燃烧过程的常规发动机的结果进行了比较。试验发动机中的空气-燃料混合物分层方法，通过使用带有预燃室的两级燃烧系统，可以燃烧总过量空气比率（lambda）高达2.0的稀薄混合物，从而减少了氮氧化物的排放在发动机的废气中。实施常规单级燃烧过程的试验发动机允许正确燃烧过量空气比率不超过1.5的空气-燃料混合物。在λ值> 1.5中，变异系数的增加表示平均有效压力（COVIMEP），并且降低了发动机的热效率（ITE），这几乎变得不可行。发动机采用λ= 2.0的状态进行两级燃烧，可将废气中的NOx含量降低至约0.02 g / kWh（对于燃气发动机）和1.15 g / kWh（对于双燃料发动机） 。这些值显着小于常规发动机中获得的值，该值表示以NOx -26.25 g / kWh的排放为特征的热效率（34％）。

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