Lean-burn refers to the burning of fuel with an excess of air in an internal combustion engine. In lean-burn engines the air–fuel ratio may be as lean as 65:1 (by mass). The air:fuel ratio needed to stoichiometrically combust gasoline, by contrast, is 14.64:1.

空燃比是指在发动机 进气冲程 中吸入 气缸 的空气与燃油（汽油）重量之比，混合气中的空气与燃油的比例称为空燃比。 汽油与空气混合燃烧时，空气量过多或者过少都不能有效进行燃烧。 汽油完全燃烧所必需的空气比例，可以根据理论计算得到，并称之为理论空燃比。 具体地讲，一份汽油对14.7份空气。 因此理论 空燃比 为14.7。 必须根据发动机的工况改变空燃比。 在带有三效 催化转化器 的发动机中，发动机必须调整到理论空燃比，14.7∶1。 在带 节气门 开启时，发动机以 …

There are two primary combustion architectures for industrial gas engines: stoichiometric or "rich burn" with lambda around 1.0, and "lean burn" with lambda greater than 1.5. Choosing the type of engine that best suits an operator’s needs depends on a project’s requirements and the application’s parameters.

The highest ratio of fuel and air under which any engine can run silently without misfire is termed as lean-burn limit. The lean-burn concept is an impressive technology to design a low emission CNG engines. The CNG engines based on lean-burn approach can achieve full load thermal efficiency just like diesel engines.

2018年10月25日 · 稀薄燃烧（Lean-Burn）技术，也称为贫燃燃烧技术，是在燃料燃烧时加入过量的空气, 一方面可以显著提高燃料的利用率, 改善燃料的经济性; 另一方面大量稀混空气能降低燃烧室最高燃烧温度，从而减少氮氧化合物（NOx）的产生，进而降低氮氧化合物（NOx）的排放。

Lean-burn engines (both gasoline and diesel) enjoy higher fuel economy and cleaner emissions than conventionally tuned engines. By nature they use less fuel and emit fewer unburned hydrocarbons and greenhouse gases while producing equivalent power of a like-sized “normal” combustion engine.

Lean burn or diesel engines are characterized by lower fuel consumption and CO 2 emissions than current engines operating at a stoichiometric air/fuel ratio, but the presence of O 2 in their emissions prevents the use of current “three way” type catalysts.

lean-burn gas engine generators have NOx emissions as low as .85 grams/BHP-hr, and produce low amounts of hydrocarbons (HC), carbon monoxide (CO) and particulate matter (PM). This allows the generator sets to meet the most stringent air quality regulations without after-treatment devices in the exhaust stream.

Lean burn mode could greatly reduce pumping loss and decrease the fuel consumption of gasoline engines, although the burning rate is decreased by higher diluted intake air. In this study, dual injection stratified combustion mode is used to accelerate the burning rate of lean burn by increasing the fuel concentration near the spark plug.

2021年5月16日 · Lean-burn mixtures suffer from major limitations of frequent misfire, and partial-burn cycles due to which it results in relatively lower engine performance and higher emissions. It is very important to investigate the causes and understand the mechanism behind its occurrence, in order to improve combustion stability and minimize cyclic ...