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Investigations of the Effect of Humid Air on NOₓ & PM Emissions of a CNG Engine

项目名称：	Investigations of the Effect of Humid Air on NOₓ & PM Emissions of a CNG Engine
摘要：	The objectives of the proposed investigation are to numerically and experimentally investigate the effect of a humid air system on nitrogen oxides (NOₓ) and Particulate Matter (PM) emissions of a compressed natural gas (CNG) engine. Experiments have shown that medium and heavy duty vehicles running on natural gas have lower PM, NOₓ, and non-methane hydrocarbon emissions, as compared to diesel and gasoline vehicles. However, recent U.S. Environmental Protection Agency/California Air Resources Board (EPA/CARB) regulations require much lower PM and NOₓ emissions from these vehicles. Humid air system or fumigation has been shown to be an effective approach in reducing NOₓ emissions of diesel engines. In this method, water vapor is injected into the intake air supplied for combustion. The process reduces the local temperature in the cylinders and raises the specific heat of the air-fuel mixture which also contributes to the elimination of the hot spots in the cylinders. With decreased temperature, NOₓ emissions are reduced. With an optimized system, the humid air system could substantially reduce NOₓ emissions without significant increase in hydrocarbon emissions. The proposed investigation is to investigate and quantify the effectiveness of the humid air system on emissions of a CNG engine.
状态：	Completed
资金：	89991
资助组织：	Office of the Assistant Secretary for Research and Technology
项目负责人：	Nagra, Sukhdeep
执行机构：	National Center for Metropolitan Transportation Research
主要研究人员：	Rahai, Hamid R
开始时间：	20150815
预计完成日期：	20160814
实际结束时间：	20160814