Şafak Yıldızhan

Effect of Spark Plug Alteration on Performance Using Hydrogen Enriched Gasoline in Si Engine Under Various Loads and Compression Ratios

In this study, change in brake power (BP) of a variable compression spark ignited engine was investigated with different spark plugs and hydrogen enrichment. The tests were carried out with a four stroke, single cylinder, naturally aspirated, variable compression ratio (VCR) engine. Two different compression ratios (CR) of 8.5:1 and 10:1 under %50 part throttle condition were implemented throughout the experiments. Moreover, engine loads of 8 Nm, 13 Nm and 17 Nm were applied to evaluate effects of different spark plugs and hydrogen usage at different engine loads. Copper, iridium and platinum spark plugs were tested for each experiment condition. In addition, hydrogen was added through the intake manifold with flow rates of 0, 2 and 4 lit/min to enhance combustion of VCR engine. According to test results, iridium and platinum spark plug usage, hydrogen addition and higher compression ratio improved BP significantly. This variance occurred more obvious with platinum spark plug usage comparing to iridium spark plug. In addition, effects of spark plug alteration, hydrogen addition and higher CR on enhancement of BP were comparatively lower at higher engine loads.

Dizel, Dizel-Biyodizel-Alkol Yakıt Karışımlı Sıkıştırma Oranı Değişen Bir Dizel Motorun Performans ve Emisyon Karakteristiklerinin Değerlendirilmesi

Bu calismada, sikistirma orani degistirilebilir dizel ve dizel-biyodizel-alkol karisimlari kullanilan bir dizel motorun performans ve emisyon ozellikleri ayrintili olarak degerlendirilmistir. Yakit karisimlarinin performans ve emisyon karakteristik sonuclari, dusuk kukurtlu dizel yakit ile karsilastirilmistir. Deneysel calisma, dizel yakitlara biyodizel ve alkol ilavesinin motor performansini, yanma ve emisyon ozelliklerini cok az etkiledigini gostermistir. Sonuclar, karisimdaki biyodizel orani artisinin, isil verimde azalisa ve ozgul yakit tuketiminde (SFC) ise ait artisa neden oldugunu gostermistir. Ayrica, alkol ve biyodizel yakit ilavesinin karbon monoksit emisyonunu azalttigini ve NOx ve karbon dioksit emisyonlarini ise arttirdigini ortaya cikarmistir