Thermodynamic and Environmental Assessment of Hydrogen-Microalgae RCCI Combustion: A Unified Exergy, Performance, and Emission Analysis
水素-微細藻類RCCI燃焼の熱力学・環境評価：エクセルギー、性能、排出の統合解析 (AI 翻訳)
Nikhil Bhave
🤖 gxceed AI 要約
日本語
本研究は、水素と微細藻類由来B20燃料を用いたRCCI燃焼を、負荷25〜100%で統合的に評価。低負荷では水素の自己着火抵抗により燃焼が遅延し、高負荷では火炎速度向上で前進。PR50でNO・HC排出を約75%・80%削減する一方、全負荷でエクセルギー効率が8.07%から4.87%に低下し、エントロピー生成が294.7%増加する熱力学的トレードオフを明示。
English
This study evaluates hydrogen-microalgae B20 RCCI combustion across 25-100% loads. Hydrogen retards combustion at low loads but advances it at high loads. PR50 cuts NO and HC by ~75% and 80%, yet exergy efficiency drops from 8.07% to 4.87% at full load with a 294.7% entropy increase, revealing a thermodynamic trade-off.
Unofficial AI-generated summary based on the public title and abstract. Not an official translation.
📝 gxceed 編集解説 — Why this matters
日本のGX文脈において
日本は水素社会実現を掲げ、水素内燃機関やバイオ燃料の研究が活発。本研究成果は、水素・バイオ燃料混焼時の熱効率と排出削減のトレードオフを定量的に示し、今後の水素エンジン開発や燃料政策の設計に示唆を与える。
In the global GX context
Globally, hydrogen and biofuels are key decarbonization pathways for hard-to-abate transport sectors. This paper provides a unified thermodynamic assessment that quantifies the efficiency penalty of emission reductions, informing engine design and fuel policy for hydrogen-biofuel co-combustion.
👥 読者別の含意
🔬研究者:Provides a unified exergy-performance-emission dataset for hydrogen-microalgae RCCI, useful for combustion modeling and optimization studies.
🏢実務担当者:Offers insights into the trade-offs of hydrogen premixing in diesel engines, relevant for engine manufacturers and biofuel producers.
🏛政策担当者:Highlights the need to balance emission reduction targets with thermodynamic efficiency in promoting hydrogen and biofuel technologies.
📄 Abstract（原文）
Despite the potential of Reactivity Controlled Compression Ignition (RCCI) to mitigate carbon intensity, significant gaps remain in the integrated thermodynamic assessment of hydrogen-microalgae systems, particularly concerning load-dependent irreversibilities. This study evaluates a B20 algal methyl ester (HRF) and hydrogen (LRF) framework across 25–100% loads with hydrogen premixing ratios (PR) up to 55%. The research novelty lies in providing a unified exergy-combustion-performance-emission analysis for this specific fuel pairing, quantifying the "thermodynamic price" of emissions reduction through the Exergy Depletion Factor (EDF).The methodology involved experiments on a single-cylinder diesel engine at a constant 1500 rpm using a 23° CA bTDC pilot injection and port-injected hydrogen. Thermodynamic assessments were performed against a standard ambient dead state to calculate exergy destruction and entropy generation. Results reveal a load-dependent paradigm shift: at low loads, hydrogen’s auto-ignition resistance retarded peak pressure by 3° CA, whereas at 100% load, its rapid flame velocity advanced combustion by 3° CA. Environmentally, PR50 reduced NO and HC emissions by approximately 75% and 80%, respectively. However, a critical thermodynamic trade-off was observed; while Brake Thermal Efficiency (BTE) improved by 11.5% at moderate PRs, the overall exergy efficiency decreased from 8.07% to 4.87% at full load. This decline, coupled with a 294.7% spike in entropy generation, highlights significant irreversibilities caused by chemical exergy losses in unburned exhaust species.
🔗 Provenance — このレコードを発見したソース
- scidb https://doi.org/10.57760/sciencedb.45630first seen 2026-08-07 05:58:18
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