Student:	Mustafa TUTİ
Supervisor:	Assoc.Prof.Dr.Zehra ŞAHİN
Department:	Gemi İnşaatı ve Gemi Makineleri Mühendisliği
Institution:	Graduate School of Natural and Applied Sciences
University:	Karadeniz Technical University Turkey

Title of the Thesis:	Experimental Investigation of the Effects of Water Adding to the Engine Performance and Exhaust Emissions in Diesel Engines
Level:	M.Sc.
Acceptance Date:	19/1/2012
Number of Pages:	99
Registration Number:	i2429

Summary:

In the present study, the effects of water injection (WI) into intake air on the engine

performance and exhaust emissions have been investigated in a Renault K9K 700 type

turbocharged automotive diesel engine which has common-rail injection system. Experiments

have been performed at different loads, engine speeds and various water ratios (WRs). The

water has been injected into intake air by a carburetor, which main nozzle section is adjustable,

at approximately 2%, 4 %, 6 %, 8 %, 10 % ratios.

It was determined from the experimental results that the WI at specified ratios into

intake air improves somewhat the engine performance and decreases significantly NOx and

smoke index K. K smoke index decreases by increasing of WRs at (2000, 2500 and 3000)

rpm. Its maximum reduction has been obtained as 41.75 % for 11.71 % WR at 3000 rpm.

At chosen loads and engine speeds, as WRs increases, NOx emissions decrease. More

effective reduction NOx has been obtained after 6 % WR. At 2500 rpm, at full load (520 N)

and at 1/1 fuel deliver rate (FDR), maximum decrement of NOx emission has been

obtained as 12.489 % for 9.400 % WR. As WR increases, brake specific fuel consumption

(BSFC) takes values close to the neat diesel fuel (NDF) or decreases. BSFC decreases

approximately 0.5 % for (4-6) % WR at 2500 rpm. Effective power takes values close to

NDF. At 3000 rpm, at full load (460 N) and at 1/1 FDR maximum increment ratio has been

obtained as approximately at the level of 1.173 % for 6.543% WR.

Key Words: NOx emissions, Smoke index K, Engine characteristics, Injected water into

intake air, Common-rail injection system