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异辛烷燃烧过程的声场激励调控特性

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从宏观与微观层面分析了超声波对异辛烷燃烧的调控作用机理，利用发动机台架试验验证了原机三维燃烧数值模拟模型，基于燃烧室内物理嵌入动网格声源面方法，实现将20 kHz振幅为300 μm超声波成功馈入燃烧室。将有、无超声波馈入燃烧室的工作缸压差值作为超声辐射压力扰动，研究了超声场激励对异辛烷的着火延迟期、中间反应组分及敏感性的影响特性。通过对比分析超声馈入方案S1～S3及无超声馈入方案S0，结果表明:S1～S3方案均使燃烧相位得以提前，S2和S3中C3H6、1C4H8和C2H4的峰值摩尔分数分别提升42。1％、24。7％、27。5％和21。5％、9。6％、5。3％，且两者异辛烷燃尽时间均提前0。18 s。当量比为1且初始温度分别为1 300 K和1 700 K时，着火延迟期分别缩短31。8％和6。4％，且均促进了 OH自由基的大量生成。
Acoustic Field Excitation and Regulation Characteristics of Iso-Octane Combustion Process
The regulation mechanism of ultrasound on iso-octane combustion was analyzed from the macro and mi-cro levels.The three-dimensional computational fluid dynamics model of the original engine was calibrated using the bench test data.Based on the method of physically embedding the dynamic grid sound source surface in the combustion chamber,the ultrasonic with 20 kHz frequency and 300 μm amplitude was successfully fed into the combustion chamber.Taking the difference between the cylinder pressure with and without ultrasonic wave feeding into the combustion chamber as the ultrasonic radiation pressure disturbance,the effects of ultrasonic field excita-tion on the ignition delay period,intermediate reaction components and sensitivity analysis of iso-octane were stud-ied.By comparing and analyzing the simulation results of three ultrasonic-fed schemes S1—S3 with no ultrasonic-fed scheme S0,the results show that the S1—S3 schemes can advance the combustion phase,and the peak mole frac-tions of C3H6,IC4H8 and C2H4 in S2 and S3 are increased by 42.1％,24.7％,27.5％and 21.5％,9.6％,5.3％,respectively and the iso-octane burnout time of both schemes are advanced by 0.18 s.When the equivalence ratio is 1 and the initial temperature is 1 300 K and 1 700 K,the ignition delay period is shortened by 31.8％and 6.4％,respectively and both promote to produce a large number of OH radicals.

iso-octanecombustion characteristicscombustion regulationultrasonic field excitationignition delay period

邸立明、欧阳强、支富祥、史程

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燕山大学车辆与能源学院,河北秦皇岛 066004

燕山大学河北省特种运载装备重点实验室,河北秦皇岛 066004

异辛烷 燃烧特性 燃烧调控 超声场激励 着火延迟期

教育部"春晖计划"合作科研资助项目河北省自然科学基金面上资助项目河北省高等学校科学技术研究资助项目燕山大学基础创新科研培育资助项目燕山大学基础创新科研培育资助项目

HZKY20220239E2020203127QN20232242021LGZD0142021LGQN011

2024

10.16236/j.cnki.nrjxb.202401004

内燃机学报
中国内燃机学会

内燃机学报

CSTPCD北大核心
影响因子：0.76
ISSN：1000-0909
年,卷(期)：2024.42(1)
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