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Controlled autoignition of hydrogen in a direct-injection optical engine

机译：直喷式光学引擎中氢气的受控自燃

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Research into novel internal combustion engines requires consideration of the diversity in future fuels in an attempt to reduce drastically CO_2 emissions from vehicles and promote energy sustainability. Hydrogen has been proposed as a possible fuel for future internal combustion engines and can be produced from renewable sources. Hydrogen's wide flammability range allows higher engine efficiency than conventional fuels with both reduced toxic emissions and no CO_2 gases. Most previous work on hydrogen engines has focused on spark-ignition operation. The current paper presents results from an optical study of controlled autoignition (or homogeneous charge compression ignition) of hydrogen in an engine of latest spark-ignition pentroof combustion chamber geometry with direct injection of hydrogen (100 bar). This was achieved by a combination of inlet air preheating in the range 200-400 ℃ and residual gas recir-culated internally by negative valve overlap. Hydrogen fuelling was set to various values of equivalence ratio, typically in the range φ = 0.40-0.63. Crank-angle resolved flame chemiluminescence images were acquired for a series of consecutive cycles at 1000 RPM in order to calculate in-cylinder rates of flame expansion and motion. Planar Laser Induced Fluorescence (LIF) of OH was also applied to record more detailed features of the autoignition pattern. Single and double (i.e. 'split' per cycle) hydrogen injection strategies were employed in order to identify the effect of mixture preparation on autoignition's timing and spatial development. An attempt was also made to review relevant in-cylinder phenomena from the limited literature on hydrogen-fuelled spark-ignition optical engines and make comparisons were appropriate.
机译：对新型内燃机的研究需要考虑未来燃料的多样性，以期大幅减少车辆的CO_2排放并提高能源的可持续性。氢已被提出作为未来内燃机的可能燃料，并且可以由可再生资源产生。氢气的可燃范围很广，与传统燃料相比，具有更高的发动机效率，同时减少了有毒物质的排放，并且没有二氧化碳。以前有关氢发动机的大多数工作都集中在火花点火操作上。当前的论文是对直接喷射氢气（100巴）的最新火花点火五点燃烧室几何形状的发动机中氢的受控自燃（或均质充量压缩点火）进行光学研究的结果。这是通过在200-400℃范围内对进气进行预热和通过负阀重叠在内部再循环的残留气体来实现的。氢燃料设定为各种当量比值，通常在φ= 0.40-0.63的范围内。为了计算出缸内火焰膨胀和运动的速率，以1000 RPM的一系列连续周期获取了曲轴角分辨的火焰化学发光图像。 OH的平面激光诱导荧光（LIF）也用于记录自燃模式的更详细特征。为了确定混合物制备对自燃时间和空间发展的影响，采用了单次和双次（即“每循环'分裂”）氢气注入策略。还尝试从有关氢燃料的火花点火光学引擎的有限文献中回顾相关的缸内现象，并进行比较是适当的。

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