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Effect of water/methanol injection on the performance of a spark ignition engine

Jatana, Gurveer (2014). Effect of water/methanol injection on the performance of a spark ignition engine. Bachelor of Engineering (4th Year Project) Thesis, Charles Darwin University.

Document type: Thesis
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Author Jatana, Gurveer
Title Effect of water/methanol injection on the performance of a spark ignition engine
Institution Charles Darwin University
Publication Date 2014
Thesis Type Bachelor of Engineering (4th Year Project)
Subjects 0913 - Mechanical Engineering
Abstract There have been many investigations on methods of water injection and their effects on engine performance. Water injection, also known as Anti-Detonant Injection (ADI), is a method of cooling the combustion chamber of an internal combustion (IC) engine by adding water to the incoming air-fuel mixture. Water is far more effective compared to gasoline when it comes to absorbing heat energy with a latent heat of vaporization about 6 times that of gasoline. By absorbing more heat energy, the in-cylinder temperatures are reduced thus helping to supress detonation. With a cooler and denser air charge, the Engine Control Unit (ECU) can advance the ignition timing and take advantage of the increased power.

This study experimentally investigated the effect of water injection on the torque output, air intake temperature and exhaust gas temperatures in a naturally aspirated, spark ignition (SI) engine where water was injected at the intake port just before throttle body. Furthermore, this study also investigated the effect of water injection on detonation.

A suitable water injection kit from Snow Performance was chosen to conduct the experiments. The experiments were conducted to test water to fuel mass flow rate ratios of 0%, 10%, 15% and 20% at constant engine speed set at 3000rpm and at Wide Open Throttle (WOT).

The results showed that with increasing mass ratios of water to fuel injected into the engine, the intake air temperature and exhaust gas temperature decreases. Water injection at 20% mass ratio of water to fuel resulted in the lowest intake air temperature and lowest exhaust gas temperature. The engine torque on the other hand was observed to decrease with increasing water injection flow rate. However due to the lower intake temperature, advancing the ignition timing is permitted. It was found that with water injection, the knock is suppressed and detonation occurs at later spark ignition timing. It was concluded that water injection at 15% mass ratio of water to fuel was the optimal injection amount for the Ford Barra engine operating at the speed of 3000rpm with WOT. At this ratio of water injection, the power output was the highest with the ignition timing at 27°bTDC (where knock occurs) and also produces low exhaust gas temperature and low intake air temperature compare to the engine‟s original performance characteristics.
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Created: Fri, 24 Apr 2015, 16:23:04 CST by Jessie Ng