Kısmi seramik kaplı pistonlu buji ateşlemeli motora su enjeksiyonunun etkileri

Yanma odasından dışarıya transfer edilen ısı miktarı yanma verimini direkt etkilemektedir. Isı transfer miktarının artması yanma verimini azaltmaktadır. Motorlarda termal kaplama yöntemleri ile ısı transfer miktarı azaltılarak yanma verimi artmaktadır. Fakat yanma odasının tamamının termal malzeme ile kaplanması buji ateşlemeli motorlarda vuruntu temayülünün artmasına ve emisyon değerlerinin kötüleşmesine neden olmaktadır. Vuruntu temayülünün ve emisyon değerlerinin azaltılmasında en etkiyi yöntemlerinden biri de su-buhar enjeksiyon yöntemidir. Su enjeksiyon yöntemi ile motor performans parametrelerinde kötüleşme olmadan emisyon değerleri kayda değer oranlarda azaltılabilmektedir. Çalışmada, motor verimini arttırmak için piston üst yüzeyi ısı rezervi yüksek MgOZrO2 seramik malzeme ile kısmi kaplanmıştır. Kaplamalı motora, anlık yakıt tüketiminin %10, %20 ve %30 kütlesel oranlarında emme manifolduna su püskürtülmüştür. İki yöntem aynı anda kullanılarak performans parametreleri ve egzoz emisyonlarında iyileşmeler elde edilmiştir. TBL pistonlu motorda güç, tork, özgül yakıt sarfiyatı, efektif verim ve HC emisyonları iyileşirken NOx emisyonları artmaktadır. Emme manifolduna su enjeksiyon yapılması durumunda ise performans parametrelerinde kötüleşme olmadan artan NOx emisyonları azalmaktadır. % 20 su püskürtme oranında motor torku ve efektif güçte % 4,1, özgül yakıt sarfiyatında, %3,8 ve efektif verimde %3,9 oranlarında iyileşmeler saptanmıştır. NOx emisyonlarında %30 su püskürtme oranında standart motor verilerine göre %20 oranında azalma elde edilmiştir. Ayrıca %20 su püskürtme oranında HC emisyonlarında % 33’e varan oranlarda azalmalar saptanmıştır.

Anahtar Kelimeler:

Termal kaplama, su enjeksiyonu, motor performans

Effects of water injection on a partially ceramic coated piston spark plug ignition engine

The amount of heat transferred from the combustion chamber directly affects the combustion efficiency. Increasing the amount of heat transfer reduces the combustion efficiency. With thermal coating methods in engines, the amount of heat transfer is reduced and the combustion efficiency is increased. However, covering the entire combustion chamber with thermal material causes an increase in the knocking tendency and worsening of emission values in spark ignition engines. One of the most effective methods in reducing the knocking tendency and emission values is the water-steam injection method. With the water injection method, emission values can be reduced significantly without worsening engine performance parameters. In the study, the upper surface of the piston was partially covered with MgOZrO2 ceramic material with high heat reserve in order to increase the engine efficiency. The coated engine was sprayed with water into the intake manifold at 10%, 20% and 30% by mass of instantaneous fuel consumption. By using the two methods at the same time, improvements in performance parameters and exhaust emissions have been achieved. In the TBL piston engine, power, torque, specific fuel consumption, effective efficiency and HC emissions improve, while NOx emissions increase. In the case of water injection into the intake manifold, the increased NOx emissions decrease without any deterioration in performance parameters. Improvements were found in engine torque and effective power by 4.1%, specific fuel consumption by 3.8% and effective efficiency by 3.9% at 20% water injection rate. Compared to standard engine data, a 20% reduction was achieved in NOx emissions at 30% water injection rate. In addition, reductions of up to 33% were detected in HC emissions at 20% water spraying rate.

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