Effect of intake manifold water injection on a natural gas spark ignition engine: an experimental study

4th International Conference on Mechanical Engineering Research

Arruga, H.^1 ; Scholl, F.^1 ; Kettner, M.^1 ; Amad, O.I.^2 ; Klaissle, M.^3 ; Giménez, B.^4

Karlsruhe University of Applied Sciences, Germany^1

Universiti Malaysia Pahang, Malaysia^2

SenerTec Kraft-Wärme-Energiesysteme GmbH, Germany^3

University of Valladolid, Spain^4

关键词: Combined heat and power;    Combustion duration;    Combustion instabilities;    Combustion parameters;    Design and Development;    Engine efficiency;    Indicated mean effective pressure;    Naturally aspirated;   

Others  :  https://iopscience.iop.org/article/10.1088/1757-899X/257/1/012029/pdf
DOI  :  10.1088/1757-899X/257/1/012029

来源: IOP

【 摘 要 】

Design and development of gas CHP (combined heat and power) engines are strongly influenced by the progressively more severe European NOxemissions normative. Water injection represents a promising approach to reduce these emissions while attaining high engine efficiency. In this work, the effect of intake manifold water injection on combustion parameters and performance of a single-cylinder naturally aspirated natural gas spark ignition engine is presented. First, the most appropriate injector was selected, using a spray test bed. Subsequently, engine experiments at constant indicated mean effective pressure (IMEP) and engine speed were conducted with water-fuel ratios of 0.1 to 0.3. IMEP was kept constant at about 6.3 bar by adjusting both air-fuel ratio and spark timing. A NOxreduction of 0.2 g/kWhi (15 %) for a constant ISFC of about 204 g/kWhi was achieved. In the low NOxregime, water injection allows for an improvement of the NOx-ISFC trade-off, while leading to poor fuel consumption at same NOxin the high efficiency regime. Furthermore, water injection implies a reduction of intake mixture temperature, lengthened burning delay and combustion duration and a moderate increase of combustion instability.