车用液化天然气加热器性能的试验研究

对天然气加热器进行了台架试验。因气态燃料极易与空气混合燃烧,故不易在热交换器内壁产生积炭和烟灰,其热效率比燃油加热器高10%以上。为了消除高温燃气因流动短路而造成的热损失,尝试了在热交换器肋片出口端面增加燃气均流环并进行了试验。另外,为了削弱热辐射及传导所造成的热能流短路损失,还做了在燃烧室外加装遮热筒试验,其试验效果显著。

Experimental Research of Vehicle Liquefied Natural Gas Heater

In this paper,experimental researches were carried out on the natural gas heater.Since gaseous fuel mixed with air is easy to burn,little of carbon distribution is produced in the interior of heater exchanger,and the thermal efficiency of gas heater can be improved by more than10% compared with fuel heater.In order to reduce the thermal losses because of hot gas flowing in a short way,we tried an experiment in which a gas current-sharing hoop was added on the exit of heater exchanger rib.In addition,we installed a heat-protection tube out of the combustion chamber so that we could diminish the thermal losses during the process of heat radiation and heat exchange,and the experimental results are obvious.