Kazim Ali Hussain, Khan Muhammad Bilal, Nazir Rabia, Shabbir Aqsa, Abbasi Muhammad Salman, Abdul Rab Hamza, Shahid Qureishi Nabeel
Department of Mechanical Engineering, University of Engineering and Technology, Lahore, Pakistan.
Department of Electrical Engineering, University of Engineering and Technology, Lahore, Pakistan.
Sci Prog. 2020 Apr-Jun;103(2):36850420921685. doi: 10.1177/0036850420921685.
Compression ignition engines are one of the world's largest consumers of fossil oil but have energy extraction efficiency limited to 35%. Addition of hydrogen alongside diesel fuel has been found to improve engine performance and efficiency; however, after a certain limit, hydrogen begins to show adverse effects, mainly because the ratio of oxygen to fuel decreases. This can be overcome by using oxyhydrogen, which is a mixture of hydrogen and oxygen gas. In this study, effects of addition of oxyhydrogen generated by electrolysis, with varying flows at the intake manifold, on a 315 cc compression ignition engine alongside diesel were analyzed. The engine was mounted on a Thepra test bed and torque measurements were taken at predetermined test points for diesel and 6 and 10 standard cubic feet per hour flowrates of oxyhydrogen. H10 showed the maximum improvement in engine performance equating to a 22.4% increase in both torque and power at 3000 r/min, and a 19.4% increase in efficiency at 2600 r/min was recorded. The large increase in engine performance as compared to previous results is because of high oxyhydrogen flowrate to displacement volume ratio. The oxyhydrogen flowrate to displacement ratio is the most important factor as it is directly impacts engine performance. The difference in engine performance because of oxyhydrogen becomes prominent at higher engine speed due to high suction pressure. No experimental flowrates of oxyhydrogen showed any adverse effect on the engine performance.
压燃式发动机是全球最大的化石燃料消耗者之一，但其能量提取效率限制在35%。研究发现，在柴油燃料中添加氢气可改善发动机性能和效率；然而，超过一定限度后，氢气开始显示出不利影响，主要是因为氧气与燃料的比例降低。这可以通过使用氢氧混合气来克服，氢氧混合气是氢气和氧气的混合物。在本研究中，分析了在315 cc压燃式发动机中，将电解产生的氢氧混合气以不同流量添加到进气歧管中并与柴油混合后的效果。发动机安装在Thepra试验台上，并在预定的测试点测量柴油以及每小时6和10标准立方英尺流量的氢氧混合气的扭矩。H10在发动机性能方面显示出最大的改善，在3000转/分钟时扭矩和功率均提高了22.4%，在2600转/分钟时效率提高了19.4%。与先前的结果相比，发动机性能的大幅提升是由于氢氧混合气流率与排量之比很高。氢氧混合气流率与排量之比是最重要的因素，因为它直接影响发动机性能。由于高吸气压力，在较高发动机转速下，氢氧混合气对发动机性能的影响差异变得更加显著。氢氧混合气的任何实验流量均未对发动机性能显示出任何不利影响。
