The article deals with the subject of the impact of an exhaust system on the power of the internal combustion engine. In particular the article shows the possibility of increasing a power of the gasoline drive unit, interfering only with an exhaust system. The purpose of the tests carried out is to compare the results of measurements from the chassis dynamometer before and after the modification, and additionally to perform simulations for the key parts of the system in terms of shaping the power and torque curves. The analysis includes a simulation model of the exhaust gas flow through the serial manifold and also the sport manifold, especially the pressure distribution and the course of the velocity vectors at the characteristic points of the element. Before obtaining the final results of power measurements on the sport units, the roughness of the steel from which the collectors were made was also measured. The final stage is the measurement of power on the new exhaust system. The obtained results of power measurements and simulations were presented in the form of a summary, which focused on the impact of individual fluid mechanics phenomena on the formation of power and torque curves and detailing the advantage of the new exhaust system in comparison with factory system in terms of increasing the performance of the tested vehicle.
The article was written in cooperation with Autocomp Management Sp. z o.o. from Szczecin, Research and De-velopment Center – producer of simulators on the military and civilian market from Poland.
ANSYS. ANSYS-Fluent-Tutorial-Guide_r170.pdf.
ANSYS. ANSYS Meshing User's Guide_r130.pdf. ANSYS 2013.
Allawi MKA, Oudah MH, Mejbel M. Analysis of exhaust manifold of spark-ignition engine by using computational fluid dynamics (CFD). Journal of Mechanical Engineering Research and Developments. 2019;42(5).
Chandak A. Investigation and design modification in exhaust manifold. SSRN Electronic Journal. 2020:6.
Cho K-S, Son K-B, Kim U-K. Design of exhaust manifold for pulse converters considering fatigue strength due to vibration. Journal of the Korean Society of Marine Engineering. 2013;37(7):694-700.
Detailed drawing and dimensioning – auxiliary materials. Gdynia Maritime University.
FLUENT User’s Guide. ANSYS 2013.
Hessamedin N, Davood DG, Mofid G, Ghasem J, Mojtaba K. A parametric design of compact exhaust manifold junction in heavy duty diesel engine using computational fluid dynamics codes. Thermal Science. 2011;15(4):1023-1033.
Han-Chi H, Hong-Wu H, Yi-Jie B. Optimization of intake and exhaust system for FSAE car based on orthogonal array testing. International Journal of Engineering and Technology. 2012;2(3). https://www.semanticscholar.or....
Hasan JM, Mohammad WS, Mohamed TA, Alawee WH. CFD simulation for manifold with tapered longitudinal section. International Journal of Emerging Technology and Advanced Engineering. 2014;4(2):28-35.
Kanawade N, Siras O. A literature review on exhaust manifold design. International Journal of Scientific Research Engineering & Technology. 2016;5(5).
Kordziński C. Exhaust systems of high-speed internal combustion engines. WKL. Warsaw 1964.
Kowalewski A. Exhaust systems. Construction, tasks, requirements; update date: 2016.10.21.
Kordziński C. Increasing engine performance for cars and motorcycles. WKL. Warsaw 1964.
Krishnara JC, Rajesh Ruban S, Subramani N. Analysis of exhaust manifold to improve the engine performance. International Journal of Engineering & Technology. 2018;7(2.8):539-542.
LPS 3000 – chassis dynamometer. Original instructions for use BA052301-pl.
Mączyński J. Fluid mechanics. National Scientific Publishing House. Warsaw 1966.
Muchhetti M, Suman DS, Abhiman B, Madhukar S. Design and analysis of X shaped exhaust system operation using different types of profiles on high capacity vehicle. International Journal of Scientific Research in Science, Engineering and Technology. 2021;8(4):19-27.
Parts catalog of original parts BMW. (accessed on 17.04.2023).
Schmiedmann online store. (accessed on 17.04.2023).
Thangapandian P. Design and analysis of exhaust manifold for multicylinder diesel engine with monolith catalytic converter using CFD. International Journal of Applied Science and Engineering. 2022;19(1):1-9.
Umesh KS, Pravin VK, Rajagopal K. CFD analysis of exhaust manifold of multi-cylinder SI engine to determine optimal geometry for reducing emissions. International Journal of Automobile Engineering Research and Development. 2023;3(4):45-56.
Usan M, Weck O, Whitney D. Exhaust system manifold development enhancement through multi-attribute system design optimization. AIAA 2005-2066. 46th AIAA/ASME/ASCE/AHS/ASC Structures, Structural Dynamics and Materials Conference. April 2005.
Venkatesan SP, Ganesan S, Devaraj R, Hemanandh J. Design and analysis of exhaust manifold of the spark ignition engine for emission reduction. International Journal of Ambient Energy. 2020;41(6):659-664.
Zhang X, Luo Y, Wang J. Coupled thermo-fluid-solid analysis of engine exhaust manifold considering welding residual stresses. Transactions of JWRI, 2012:75-77.