Peningkatan buangan daripada penerbangan meningkat saban tahun dan perlu diambil serius. Konsep enjin baharu iaitu enjin hibrid bersifat pelbagai bahan bakar (EHPBB) mempunyai ciri-ciri unik seperti dua pembakar – pembakar utama dan pembakar antara turbin (PAT) dikatakan lebih mesra alam berbanding enjin kipas turbo yang lazim. Kajian tempohari terhadap EHPBB menekankan penggunaan gas asli cecair (GAC) yang memerlukan modifikasi terhadap konfigurasi kapal terbang untuk menyimpannya. Pelbagai jenis bahan bakar alternatif telah digunakan di dalam kajian ini sebagai penggantinya. Prestasi enjin dan buangannya telah dibandingkan dengan enjin dasar, GE90-94B dalam keadaan berlepas, naik dan jajap di samping menentukan pengaruh sifat bahan bakar terhadapnya. Dalam kajian ini, bahan bakar alternatif dibakar dalam pembakar utama manakala kerosin dibakar dalam PAT. Bahan bakar alternatif yang digunakan terdiri daripada bahan bakar ester hidroses dan asid lemak (EHAL) yang diterbitkan daripada minyak masak terpakai, campurannya, campuran bahan bakar camelina jet boleh pulih terpelaku-hidro (JBT) dan campuran bahan bakar jatropha JBT di mana kesemua campuran bahan bakar mempunyai perkadaran 50-50. GE90-94B menghasilkn daya tujah yang paling tinggi manakala EHPBB menunjukkan pengurangan buangan Nitrogen Oksida (NOx) disebabkan proses pembakaran semula dalam PAT.
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The aviation greenhouse gas emission increases annually which needs to be taken seriously. A novel engine concept of the multi-fuel hybrid engine (MFHE) which possesses the unique characteristic of dual combustor – main combustor and inter-stage turbine burner (ITB) is said to be more environmental-friendly than the conventional turbofan engine. A recent study on the hybrid engine stresses the usage of Liquified Natural Gas (LNG) but needs modification of the aircraft configuration to store LNG. Thus, a wide range of alternative fuel is used in this study as a replacement for LNG. The performance and emission of the engine are compared together with the baseline engine of GE90-94B at take-off, top-of-climb and cruise condition besides determining the influence of fuel properties towards them. In this study, alternative fuel and kerosene are combusted in the main combustor and ITB of the MFHE respectively. The alternative fuels used consists of Hydro-processed Ester and Fatty Acid (HEFA) fuel which derived from used cooking oil, its blended fuel, blended camelina Hydro-treated Renewable Jet (HRJ) fuel and blended jatropha HRJ fuel whereby all of the blended fuels have a proportion of 50-50. From the result obtained, GE90-94B gives the highest thrust while the MFHE is proven in reducing the emission of Nitrogen Oxide (NOx) due to the reheating process in ITB.
Multi-fuel hybrid engine performance assessment / Muhammad Syahmi Dzani