Ignition and Combustion Enhancement of Transient Fuel Spray by Plasma Jet

等离子射流瞬态燃油喷雾的点火与助燃

基本信息

批准号：
01550179
负责人：
HANADA Kunihiko
金额：
$ 1.28万
依托单位：
Kyushu University
依托单位国家：
日本
项目类别：
Grant-in-Aid for General Scientific Research (C)
财政年份：
1989
资助国家：
日本
起止时间：
1989 至 1990
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-01550179/
关键词：
Plasma Jet Ignition Lean Mixture Turbulent Combustion Pulsed Jet Combustion Transient Fuel Spray 乱流混合気旋回流希薄可燃限界

项目摘要

In order to make clear both the ignition ability of the plasma jet to the transient fuel spray and its combustion enhancement effects, combustion tests were carried out using the constant volume combustion chamber. In the tests, lean methane-air mixtures, which had the maximum swirl speed of 10m/s, were used. From the schlieren photographs, in the case of plasma jet ignition, the turbulent plume of the flame formed by the plasma jet was moved toward the center of the combustion chamber by the swirl motion, where the subsequent flame development occurred. As the result, the rapid combustion pressure rise was obtained by the plasma jet ignition in its initial period, however, after that, the combustion pressure rise was slower than that by the conventional spark ignition. So, the new type of plasma jet igniter, the cavity of which was projected into the combustion chamber, was made. Using this projected type of plasma jet igniter, flame holding effect by the projected cavity was obtained, and it made the combustion enhancement effects during the whole combustion period.Gaseous methane was injected into the closed combustion chamber, and this transient fuel spray was tried to be ignited by the plasma jet igniter, however, the possibility of the ignition was very low. Therefore, we tried to use the pulsed jet ignition combustion generator. The shape of this generator was just as same as the plasma jet igniter, however, the rich mixture was introduced into the cavity, and the ordinary electrical ignition system was used to ignite the mixture in the cavity. From the combustion tests, we found that the pulsed jet combustion generator has the combustion enhancement effects throughout the whole combustion period, especially its later period of the combustion. This was caused both by the turbulent unburned mixture issued from the orifice before the ignition and the turbulent flame injected from the orifice after the ignition.

为了清除等离子射流对瞬时燃油喷雾剂及其燃烧增强效果的点火能力，使用恒定体积燃烧室进行了燃烧测试。在测试中，使用了最大漩涡速度为10m/s的瘦甲烷 - 空气混合物。从Schlieren照片中，对于等离子喷射点火开关，由等离子体射流形成的火焰的湍流被旋转到燃烧室的中心，并通过随后发生的火焰发育发生。结果，血浆射流点火在其初始时期获得的快速燃烧压力升高，但是，此后，燃烧压力上升的升高比常规火花点火速度要慢。因此，制造了新型的等离子喷射点火器，其腔被投影到燃烧室中。使用这种投影类型的等离子体喷气点火器，获得了预计的腔体的火焰固定效果，并在整个燃烧期间都会燃烧增强效果。将甲烷注入封闭燃烧室中，并试图通过等离子喷射仪点燃这种短暂燃料喷雾剂，但是，该点火的可能性非常低。因此，我们尝试使用脉冲喷射点火燃烧器。该发电机的形状与等离子射流点火器一样相同，但是，将丰富的混合物引入了腔体中，并使用普通的电气点火系统来点燃腔中的混合物。从燃烧测试中，我们发现脉冲射流燃烧生成器在整个燃烧期内具有燃烧增强效应，尤其是其后期的燃烧期。这既是由于点火开关前从孔口发出的湍流未燃烧的混合物以及点火开关后从孔口注入的湍流的混合物引起的。