PLIF-LIBS複合診断による水素ジェット成層の定量的特性評価
Quantitative Characterization of Hydrogen Jet Stratification Using Combined PLIF-LIBS Diagnostics (原題)
Kim JJ, Lee S, Ki Y, Yang H, Bae M, Bae C, Hwang J
🤖 gxceed AI 要約
日本語
水素直接噴射エンジン向けに、PLIFとLIBSを組み合わせた光学診断法を開発し、水素ジェットの二次元濃度場を定量的に再構成した。定容容器内での実験により、噴射初期の中空円錐形状、中期の渦による燃料濃縮、後期の運動量支配の軸方向拡がりを解明した。CFDモデルの検証や噴射戦略の最適化に有効な手法を提供する。
English
This study develops a combined PLIF-LIBS optical diagnostic to quantitatively reconstruct two-dimensional hydrogen concentration fields in direct-injection jets. Experiments in a constant-volume chamber reveal hollow-cone injection, vortex-driven fuel-rich pockets, and momentum-dominated axial spreading. The method provides a robust framework for validating CFD models and optimizing hydrogen injection strategies.
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
水素内燃機関は日本の水素社会実現に向けた重要技術であり、本計測手法は燃焼効率向上とNOx排出削減に貢献する。自動車メーカーやエンジン開発企業にとって、水素噴射戦略の最適化に直接活用できる知見を提供する。
In the global GX context
As hydrogen internal combustion engines gain attention globally for zero-carbon transport, this diagnostic approach supports the development of efficient and clean hydrogen combustion systems. The methodology offers a pathway to optimize injection strategies, contributing to the broader energy transition in the transportation sector.
👥 読者別の含意
🔬研究者:Provides a validated optical diagnostic framework for quantifying hydrogen jet stratification, useful for CFD model validation and combustion research.
🏢実務担当者:Offers insights for optimizing hydrogen direct-injection strategies in engine development, potentially improving efficiency and reducing emissions.
📄 Abstract（原文）
<title>Abstract</title> <p>Hydrogen direct injection offers high flame speed and zero-carbon operation, but its wide flammability requires precise control of mixture stratification. Optical diagnostics such as planar laser-induced fluorescence (PLIF) and laser-induced breakdown spectroscopy (LIBS) have been applied to study hydrogen jets. PLIF provided global visualization of hydrogen jet morphology, while LIBS supplied local equivalence-ratio measurements for calibration. By combining both techniques, quantitative two-dimensional fuel concentration fields of hydrogen jets were successfully reconstructed. Experiments in a constant-volume chamber at engine-like ambient pressure (0.5 MPa) and injection durations (500µs) demonstrated that the fused PLIF–LIBS approach quantified hydrogen jet stratification. Results revealed hollow-cone injection in the early stages, vortex-driven enrichment producing fuel-rich pockets in the mid stages, and momentum-dominated axial spreading in the later stages. The combined methodology overcomes the limitations of each diagnostic and provides a robust framework for validating CFD models and optimizing injection strategies for direct-injection hydrogen.</p>
🔗 Provenance — このレコードを発見したソース
- Research Square https://doi.org/10.21203/rs.3.rs-10603159/v1first seen 2026-09-08 04:21:19 · last seen 2026-09-21 04:22:12
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