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teoman · 03-26-2017, 08:01 AM

I found another paper.

"In this study, the effects of steam injection at different injection rates on the evaluations of performance parameters and emissions of a gasoline engine have been investigated. Electronically controlled steam injection method has been used to inject the steam into the engine. The optimum steam ratio has been determined as 20% of fuel mass (S20) in terms of performance and emission parameters. Steam injected gasoline engine has been modeled by using zero-dimensional two-zone combustion model for optimum steam ratio at full load condition. The obtained results have been compared with conventional gasoline engine in terms of performance and NO, CO, CO2, HC emissions. The results of theoretical combustion model agree with experimental data quite well. In the experimental results, it is seen that the engine torque and the effective power increase up to 4.65% at 3200 rpm, specific fuel consumption reduces up to 6.44% at 2000 rpm. There is 40% average reduction in NO emissions at 2800 rpm and it is 31.5% in HC emissions at 2000 rpm. "

The calculated mass more or less agrees with our previous calculations.

https://www.researchgate.net/publica...gnition_engine

Steam has been obtained by means of exhaust waste heat from waste heat boiler. Steam in the waste heat boiler, which is kept in the form of saturated water with conditions of 3 bar and 133.5 C, was injected with injectors which are positioned at the back of intake valve in the manifold.

I wonder how much of this due to the increase in temperature and how much is due to the water.

Anyhow, it appears that %6 is the maximum improvement i can expect from this system which is not bad at all.

03-26-2017, 08:01 AM	#40 (permalink)
teoman Master EcoModder Join Date: Jan 2017 Location: Istanbul Posts: 1,245 A3 - '12 Audi A3 Thanks: 65 Thanked 225 Times in 186 Posts	I found another paper. "In this study, the effects of steam injection at different injection rates on the evaluations of performance parameters and emissions of a gasoline engine have been investigated. Electronically controlled steam injection method has been used to inject the steam into the engine. The optimum steam ratio has been determined as 20% of fuel mass (S20) in terms of performance and emission parameters. Steam injected gasoline engine has been modeled by using zero-dimensional two-zone combustion model for optimum steam ratio at full load condition. The obtained results have been compared with conventional gasoline engine in terms of performance and NO, CO, CO2, HC emissions. The results of theoretical combustion model agree with experimental data quite well. In the experimental results, it is seen that the engine torque and the effective power increase up to 4.65% at 3200 rpm, specific fuel consumption reduces up to 6.44% at 2000 rpm. There is 40% average reduction in NO emissions at 2800 rpm and it is 31.5% in HC emissions at 2000 rpm. " The calculated mass more or less agrees with our previous calculations. https://www.researchgate.net/publica...gnition_engine Steam has been obtained by means of exhaust waste heat from waste heat boiler. Steam in the waste heat boiler, which is kept in the form of saturated water with conditions of 3 bar and 133.5 C, was injected with injectors which are positioned at the back of intake valve in the manifold. I wonder how much of this due to the increase in temperature and how much is due to the water. Anyhow, it appears that %6 is the maximum improvement i can expect from this system which is not bad at all. Last edited by teoman; 03-26-2017 at 08:52 AM..