COMBUSTION PROCESS
Water injection represents the key technology to achieve high specific engine power with lambda = 1. Reduction of the mixture temperature associated with high evaporation enthalpy of water at the end of compression allows for a significant increase of the efficiency of the high-pressure cycle [1, 2]. Therefore, fuel enrichment to reduce the exhaust gas temperature is not necessary and the boost pressure can be delivered with a single-stage boosting system. By using water injection, a specific power of 200 kW/l can be achieved with only slightly retarded spark timing at the same time, 1. An absolute boost pressure of approximately 3.3 bar is required to reach the 200 kW/l operating point, which can be supplied with a single-stage compressor.
The position of the water injector in the intake port has been optimised with the help of 3D computational fluid dynamics (CFD) combustion chamber flow simulations. The injector position that is furthest away from the valve shows the highest amount of wall film, because the water can wet the largest area, 2. For water injection closer to the valve, the share decreases significantly, whereby the improvements for a distance of less than 60 mm are minor. For water injection close to the combustion chamber the liquid water share, which passes the intake valves and evaporates only in the combustion chamber, increases (direct injection effect). This results in a more effective cooling of the mixture, which is expressed in lower mean cylinder temperatures at the end of compression.
هذه القصة مأخوذة من طبعة February 2020 من Auto Tech Review.
ابدأ النسخة التجريبية المجانية من Magzter GOLD لمدة 7 أيام للوصول إلى آلاف القصص المتميزة المنسقة وأكثر من 9,000 مجلة وصحيفة.
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هذه القصة مأخوذة من طبعة February 2020 من Auto Tech Review.
ابدأ النسخة التجريبية المجانية من Magzter GOLD لمدة 7 أيام للوصول إلى آلاف القصص المتميزة المنسقة وأكثر من 9,000 مجلة وصحيفة.
بالفعل مشترك? تسجيل الدخول
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