Experimental analysis of a diesel engine run on non-conventional fuel blend at different preheating temperatures Rahul Kumar, Anil Singh Yadav, Abhishek Sharma, Upendra Rajak, Tikendra Nath Verma, et al. Proceedings of the Institution of Mechanical Engineers Part E Journal of Process Mechanical Engineering, 2025 Due to urbanisation, the reuse of scrap tyres in the form of energy has gained attention for the disposal of waste tyres. Among the numerous methods, pyrolysis appears to be possible, appealing and viable for generating products such as pyrolysis oil, which can be combined with petroleum oils and used as a source of energy. In a prior study, a mixture of jatropha methyl ester (JME) and tyre pyrolysis oil (TPO) was used as a diesel engine fuel, and it was discovered that the JMETPO20 (JME80% + TPO20%) blend gave better results among all the test blends but inferior than diesel operation. Also, it was reported that due to higher viscosity of the JMETPO20 blend, engine gave inferior performance than diesel operated engine. In this context, an attempt has been made to utilize the JMETPO20 blend at different preheating temperatures to substitute conventional diesel. The blend was preheated at three different temperatures, that is, 50, 60 and 70°C and experiments were carried out in a single-cylinder diesel engine with a rated output of 4.4 kW. The results of the investigations were analysed and compared with diesel and presented in this study.
Speculative investigation of performance & combustion of waste plastic oil blended with diesel as an alternate fuel in single cylinder diesel engine employing is: 10000 standards Maulik A. Modi, Tushar M. Patel, Ankit D. Oza, Sandeep Kumar, Rahul Kumar Multidisciplinary Science Journal, 2025 In contemporary times, plastic waste recycling has emerged as a crucial trend, presenting significant potential for plastic reformulation and recyclability. Waste plastic, owing to its high calorific value and abundance, serves as a promising energy source. Through the pyrolysis process, plastic waste can be converted into pyrolysis oil, which exhibits properties akin to conventional diesel fuel and can be seamlessly integrated into engines. This study investigates the synthesis of waste plastic oil (WPO) via pyrolysis using a diverse feedstock comprising various types and grades of plastic. The resulting oil, resembling diesel in characteristics, is evaluated for its performance in a compression ignition (CI) engine equipped with a variable compression ratio.Experimental tests are conducted using blends of WPO and diesel ranging from 0% to 100%, across different engine loads spanning from partial to full load conditions (2 kg to 12 kg). The combustion characteristics, engine performance metrics, and emission profiles are meticulously analyzed and compared against those of conventional diesel fuel. The findings indicate that the engine exhibits comparable performance with WPO at higher loads, akin to that with diesel. However, at lower loads, an extended delay period is observed, contributing to engine stabilization.These results underscore the potential of renewable plastic oil as a viable alternative fuel for diesel engine applications, particularly under specific operating conditions. The study provides valuable insights into the feasibility and performance implications of integrating waste plastic oil into compression ignition engines, contributing to the ongoing discourse on sustainable energy solutions and waste management practices.
DESIGN AND DYNAMIC RESPONSE OF SWIRL COAXIAL INJECTORS FOR LOX-METHANE ROCKET ENGINE Rahul Kumar, Abhishek Sharma, Aravind Vaidyanathan, T. John Tharakan, S. Sunil Kumar International Journal of Fluid Mechanics Research, 2025 The optimization of injector dynamics is essential for enhancing performance, reliability, and safety in rocket engines. This study examines the dynamics of an in-house-designed, coaxial swirl injector for a high-pressure LOx-CH4 rocket system, presenting a novel methodology for a swirl injector design that incorporates both flow and geometric parameters. A comprehensive parametric study, based on Bazarov's analytical framework, is conducted to assess the influence of geometric design variables on injector dynamics. The findings indicate that increasing the vortex chamber length (Lv) reduces the dynamic response and shifts the resonance peak to lower frequencies. An optimal radius ratio (Rrt) between 1.2 and 1.8 is identified to achieve a balanced dynamic response. Additionally, variations in the convergence angle (β) have minimal impact on the injector's overall dynamics, with a 45° angle found to be optimal for manufacturing purposes. This study offers crucial design recommendations for developing stable swirl injectors with an optimized dynamic response, providing valuable insights for improving injector performance and ensuring stability in high-pressure rocket systems.
Prospects of Renewable Energy Scenario in India Rahul Kumar, Nishikant Kishor Dhapekar, Rajesh Tiwari, Y. Anupam Rao, Renuka Shyam Narain, et al. Energy Systems in Electrical Engineering, 2024
