放电参数对NH3/空气混合气纳秒脉冲多通道点火特性的影响

doi:10.13229/j.cnki.jdxbgxb.20240382

摘要/Abstract

摘要：

基于定容燃烧弹，研究了NH₃/空气混合气中放电脉冲间隔和放电脉冲数对纳秒脉冲沿面介质阻挡放电（nSDBD）的放电特性和点火特性的影响规律。放电特性测试表明：nSDBD可以产生多个独立分布的放电丝，扩大了等离子体的范围；放电脉冲间隔为50 μs时，30个放电脉冲能激发约12个放电丝，其长度约14 mm。点火特性测试表明：nSDBD实现了空间多点点火效果；脉冲间隔为50 μs时，180个放电脉冲产生了6个环绕顶部电极的初始火核；NH₃/空气混合气中，初始火核出现了消散的现象，使初始火核数量与稳定燃烧的火核数量不一致；随着脉冲间隔或脉冲数的增加，初始火核面积增大，并且稳定火核的数量从1个逐渐增加至6个，这有效缩短了NH₃/空气混合气的着火延迟，缩短量可达30 ms，约55%；脉冲间隔和脉冲数的调整可以有效控制NH₃/空气混合气的燃烧相位。

关键词: 动力机械工程, 沿面介质阻挡放电, 纳秒脉冲, 多通道点火

Abstract:

The effect of discharge pulse interval and number on the discharge and ignition characteristics of nanosecond pulse surface dielectric barrier discharge （nSDBD） in NH₃/air mixture was studied. The experiment is conducted in a constant volume combustion chamber. Discharge characteristic tests show that nSDBD can generate multiple independently distributed discharge filaments， expanding the range of plasma. When using 30 pulse numbers with a pulse interval of 50 μs， at least 12 discharge filaments are excited， with filament lengths exceeding 14 mm. The ignition characteristic test shows that nSDBD has achieved spatial multi-point ignition. When the pulse interval is 50 μs， 180 discharge pulses generate 6 initial flame kernels surrounding the top electrode. In the NH₃/air mixture， there is a phenomenon of initial flame kernels dissipating， resulting in a discrepancy between the number of initial flame kernels and the number of stable combustion flame kernels. As the pulse interval or pulse number increases， the area of the initial flame kernels increases， and the number of stable flame kernels gradually increases from 1 to 6. This effectively shortens the ignition delay of NH₃/air mixture， with a reduction of up to 30 ms， approximately 55%. The adjustment of pulse interval and pulse number can effectively control the combustion phase of NH₃/air mixture.

Key words: power mechanical engineering, surface dielectric barrier discharge, nanosecond pulsed, multi-channel ignition

中图分类号:

TK411

熊勇,田杰,程勇,赵庆武. 放电参数对NH₃/空气混合气纳秒脉冲多通道点火特性的影响[J]. 吉林大学学报(工学版), 2025, 55(12): 3783-3792.

Yong XIONG,Jie TIAN,Yong CHENG,Qing-wu ZHAO. Effect of discharge parameters on nanosecond pulse multi⁃channel ignition characteristics of NH₃/air mixture[J]. Journal of Jilin University(Engineering and Technology Edition), 2025, 55(12): 3783-3792.

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方案	PI/μs	PN	?
放电试验	50，60，70	120	1.0
放电试验	50	100，110，140，160，180	1.0
点火试验	50	100~210	1.0
	60	100~200	1.0
	70	100~180	1.0

放电参数对NH₃/空气混合气纳秒脉冲多通道点火特性的影响

Effect of discharge parameters on nanosecond pulse multi⁃channel ignition characteristics of NH₃/air mixture

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