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首页> 外文期刊>Energy Conversion & Management >Development and validation of a multi-zone combustion model for performance and nitric oxide formation in syngas fueled spark ignition engine
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Development and validation of a multi-zone combustion model for performance and nitric oxide formation in syngas fueled spark ignition engine

机译：合成气燃料火花点火发动机性能和一氧化氮形成的多区域燃烧模型的开发和验证

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The development of a zero-dimensional, multi-zone combustion model is presented for predicting the performance and nitric oxide (NO) emissions of a spark ignition (SI) engine. The model is validated against experimental data from a multi-cylinder, four-stroke, turbocharged and aftercooled, SI gas engine running with syngas fuel. This alternative fuel, the combustible part of which consists mainly of CO and H_2 with the rest containing non-combustible gases, has been recently identified as a promising substitute of fossil fuels in view of environmentally friendly engine operation. The basic concept of the model is the division of the burned gas into several distinct zones, unlike the simpler two-zone models, for taking into account the temperature stratification of the burned mixture during combustion. This is especially important for accurate NO emissions predictions, since NO formation is strongly temperature dependent. The multi-zone formulation provides the chemical species concentrations gradient existing in the burned zones, as well as the relative contribution of each burned zone to the total in-cylinder NO formation. The burning rate required as input to the model is expressed as a Wiebe function, fitted to experimentally derived burn rates. All model's constants are calibrated at one operating point and then kept unchanged. Zone-resolved combustion related information is obtained, assisting in the understanding of the complex phenomena occurring during combustion in SI engines. Combustion characteristics of the lean-burn gas engine tested are provided for the complete load range, aiding the interpretation of its performance and knocking tendency. Computed NO emissions from the multi-zone model for various values of the engine load (i.e. air-fuel ratios) are presented and found to be in good agreement with the respective experimental ones, providing confidence for the predictive capability of the model. The superiority of the multi-zone model over its two-zone counterpart is demonstrated in view of its more realistic in-cylinder NO emissions predictions when compared to the available experimental data.
机译：提出了零维多区域燃烧模型的开发，用于预测火花点火（SI）发动机的性能和一氧化氮（NO）排放。该模型已根据来自使用合成气燃料运行的多缸，四冲程，涡轮增压和后冷SI汽油发动机的实验数据进行了验证。考虑到环境友好的发动机运行，这种替代燃料的可燃部分主要由CO和H_2组成，其余部分包含不可燃气体，最近已被视为化石燃料的有希望替代品。该模型的基本概念是将燃烧的气体分为几个不同的区域，这与更简单的两区域模型不同，是考虑到燃烧过程中燃烧混合物的温度分层。这对于准确的NO排放预测尤其重要，因为NO的形成与温度密切相关。多区域配方提供了燃烧区中存在的化学物质浓度梯度，以及每个燃烧区对总缸内NO形成的相对贡献。输入模型所需的燃烧速率表示为Wiebe函数，适合于实验得出的燃烧速率。所有模型的常数都在一个工作点进行校准，然后保持不变。获得与区域解析有关的燃烧信息，有助于了解SI发动机燃烧过程中发生的复杂现象。提供了在整个负载范围内测试的稀薄燃气发动机的燃烧特性，有助于解释其性能和爆震趋势。提出了针对发动机负载的各种值（即空燃比）从多区域模型计算出的NO排放量，发现该排放量与相应的实验值非常吻合，从而为模型的预测能力提供了信心。与现有的实验数据相比，鉴于其更现实的缸内NO排放预测，证明了多区域模型优于其两区域模型的优势。

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