Water Injection of a Small Engine
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Authors
Cerulli, Derek
DeJarnette, Christian
Alkhater, Faisal Mansour R.
Li, Zheng
Issue Date
2022-03-28
Type
Other
Language
en
Keywords
Water injection systems , Air cooled engine , Mechanical engineering , Temperature reduction
Alternative Title
Abstract
The main objective of this project is to create a water injection system for a small air cooled engine. The design involves a 6.5 hp 4 stroke engine, with a displacement of 196cc. The design intent is to design an injection system to inject a water/methanol mixture at a given rate to assist the air cooling of the engine and increase the density of the intake air by decreasing the temperature. These systems are common on high performance, large 4 stroke water cooled engines in cars. Some benefits of using a water/methanol mixture is that it cools the intake air and reduces the emission of NOx from combustion. Our design is focused on creating an intake tube that will be easily bolted onto the intake of any small engine, and an injection system to inject the water mist into the tube. The solution to be injected is a water mist, which will cool the intake charge and cause the air to be denser. There will be two temperature sensors, one for the incoming air and one for the treated air with the mixture. Due to our budget constraint of $400, there will not be a NOx sensor on the exhaust to measure the emissions. In order to use the NOx emission reduction, the intake charge must have a sizable temperature reduction in the intake tube before proceeding into the engine. Our simplistic design will be able to record the temperature difference between the incoming air and treated water/methanol vapor mixture. The design also incorporates a small nozzle of size 0.003” for the mixture passageway into the tube, limiting the flow from the electric pump to prevent too much flow into the engine. The pump, which is a 12v DC powered pump, will have a potentiometer to adjust the resistance and therefore adjust the flow from the pump into the system.