Experimental Investigation of Performance and Emission Characteristics of a CI Engine Enrichment with HHO-CNG Mixtures

International Conference on Automotive and Vehicle Technologies 2014, İstanbul, Turkey, 16 - 18 October 2014, pp.223-232

In decade years, due to lack of supply-demand balance of petroleum and

exhaust emissions within environmental pollution, researchers give more attention

to endeavor of using alternative fuels in internal combustion engines. Alternative

fuels have got their own behaviors and fuel properties that they affect the engine

when used as a fuel, comes by their advantages and disadvantages. It is very

important to know and investigate theirs fuel behavior and effects of combustion

and exhaust emissions.

In this study, HHO (Hydroxy-Oxyhydrogen) gas and CNG (Compressed Natural

Gas) mixtures used in CI (Compression-Ignition) engine as an addition fuels via

intake manifold and engine performance & exhaust emissions were investigated

experimentally. In experiments engine run under below three conditions; normal

diesel operation, 1,5%CNG+Diesel operation and 15%CNG+2,2%HHO+Diesel

operation respectively between 1200-2300 rpm engine speeds. Engine performance

and exhaust emission parameters explained and illustrated with graphics as engine

torque, specific fuel consumption and engine speed; CO, CO2

, NO, NO2

. The obtained

results are presented and compared each other.

It was observed that the enrichment of diesel engine with HHO-CNG mixtures

reduced the specific fuel consumption, CO2

and NOx, however increased the CO.

At the middle engine speeds addition of HHO to CNG prevent from the decreasing

the torque values. Additionally it was observed that HHO and/or CNG, improves

the level of engine noise and down the SO2

values to zero. As a result; this study

contains, how the engine performance and exhaust emissions changes with usage

of HHO and CNG enrichment in a CI engine, were investigated in detail.