www.tjprc.org SCOPUS Indexed Journal editor@tjprc.org EFFECT OF INTAKE VALVE TIMING, DURATION STRATEGIES WITH SWIRL RATIO ON VOLUMETRIC EFFICIENCY OF SINGLE CYLINDER DIESEL ENGINE ASHISH JAIN 1 , E. PORPATHAM 2 & Dr. SUKRUT S. THIPSE 3 1,3 The Automotive Research Association of India, Pune, Maharashtra, India 2 Vellore Institute of Technology University, Vellore, Tamil Nadu, India ABSTRACT Small diesel engines are used for commercial transportation for rural and urban area due to cost and efficiency aspect. They are also the reason for pollution because of various reasons. This study aims to examine the effect of intake valve lift, timing and duration on four-stroke single-cylinder diesel engine’s volumetric efficiency. One-dimensional thermodynamic simulation analysis is carried out for gas exchange and performance improvement study with various intake valve lifts, timing and duration along with swirl variation strategies. 1D simulation model is validated within 5% band with respect to engine’s testing data. Early inlet valve opening (EIVO), closing (IVC) effect along with lift options are analyzed on engine’s volumetric efficiency. IVO timings are varied from 31˚bTDC to 5˚aBDC with an interval of 6˚CA with duration varied from 50˚ HCE to 70˚ HCE with three lift options. Cylinder head swirl is reduced by 25%, while flow coefficient is improved by 10%. This along with optimum timing and lift combination produce 5–15% improvement in volumetric efficiency at wide engine speed range in simulation. Higher lifts, wide duration and lower lift with duration is beneficial for rated and intermediate engine speeds, respectively. KEYWORDS: Valve Timing, Valve Duration, 1-Dsimulation, Intake Port Swirl, Volumetric Efficiency & Valve Lift Received: Nov 06, 2019; Accepted: Nov 26, 2019; Published: Jan 25, 2020; Paper Id.: IJMPERDFEB202037 INTRODUCTION The Indian automobile industry is traditionally dominated by diesel engines, and when we discuss about urban and rural market, the domination of small diesel engines is clearly visible in the form of small and light commercial vehicle (LCV). These vehicles are fitted with small single and two-cylinder engines with simple and robust design features. Another major reason for their high demand is congested roads and heavy traffic density in cities. Market demand for vehicle with higher torque, power, BSFC with lower cost are the driving factors for vehicle manufacturers to develop high BMEP engines. For this, they replace single cylinder engines with two-cylinder engines and two-cylinder engines with three-cylinder engines. Along with market demands, the vehicle should also meet stringent emission legislation imposed by government. Implementation of latest technological improvements is limited in these vehicles and engines because of cost considerations. These engines require continuous improvements in performance and emissions front to meet upcoming stringent emission regulations with fuel economy requirements (Squaiella et al., 2013). There are various technological pathways to improve the performance and emission of engines, some of which are supercharging, turbo charging, variable compression ratio, variable intake system geometry, variable valve timing and lift, etc. (Miller et al., 2011). Considerable improvements have been done in after treatment system as well; however, sufficient conversion efficiency is still a big problem for them (Zammit et al., 2015). Original Article International Journal of Mechanical and Production Engineering Research and Development (IJMPERD) ISSN(P): 2249–6890; ISSN(E): 2249–8001 Vol. 10, Issue 1, Feb 2020, 415–434 © TJPRC Pvt. Ltd.