Journal of Jilin University(Engineering and Technology Edition) ›› 2021, Vol. 51 ›› Issue (2): 414-421.doi: 10.13229/j.cnki.jdxbgxb20191085

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A high⁃frequency nanosecond⁃pulsed ignition system for plasma assisted ignition and combustion

Qing-wu ZHAO(),Yong CHENG(),Xue YANG,Ning WANG   

  1. School of Energy and Power Engineering，Shandong University，Jinan 250061，China
  • Received:2019-11-27 Online:2021-03-01 Published:2021-02-09
  • Contact: Yong CHENG E-mail:zhaoqwu@foxmail.com;cysgd@sdu.edu.cn

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Abstract:

High-frequency nanosecond pulsed discharge is an effective way to generate non-equilibrium plasma for plasma assisted ignition and combustion research. In this paper， a compact high-frequency nanosecond-pulsed ignition system is designed based on resonant charging and magnetic pulse compression. Details of the electrical architecture and working principles of the ignition system are presented. The system can produce high voltage pulses over 10 kV， with a rising time of 20 ns， and a full width at half maximum of 50 ns， at repetition rate up to 16 kHz. Test results show that 10 pulses at repetition rate of 16 kHz have larger discharge volume and higher brightness than single pulse， and the utilization of coaxial electrode enlarges the discharge volume compared with pin-to-pin electrode. The experiment results show that the ignition delay time of multi-pulse discharge is much shorter than that of single-pulse discharge， and coaxial electrode discharge can significantly shorten the ignition delay time compared to pin-to-pin electrode with the same pulse number.

Key words: power mechanical engineering, ignition system, plasma, nanosecond pulse

CLC Number: 

  • TK413.9

Fig.1

Schematic of NPD ignition system"

Fig.2

Equivalent circuit of pulsed power generator"

Fig.3

Simulation model of pulsed power generator"

Table 1

Parameters of magnetic core in model"

参数数值
外径/cm4
内径/cm2.5
截面积/cm1.2
饱和磁感应强度/T0.8
剩余磁感应强度/T0.7
矫顽力/(A·m-1)16

Fig.4

Simulation results of voltage waveform"

Fig.5

Simulation results：enlargement of voltage waveform of high voltage side"

Fig.6

Operating intervals of charging stage"

Fig.7

Operating intervals of discharging stage"

Table 2

Specifications of main components"

器件型号/规格说明
S1、S2FGA25N1201200 V，25 A
D1、D2FR3071000 V，3 A
C1630 V/luFCBB电容
PT磁芯40*25*20超微晶1K107J
C2、C320 kV/1 nF高压瓷片电容
D3CL01-1212 kV，0.5 A

Fig.8

Image of pulsed power generator"

Fig.9

Test results of voltage waveform"

Fig.10

Waveform of 4 pulses under a repetitive frequency of 16 kHz"

Fig.11

Voltage, current, and energy waveforms from a single nanosecond discharge pulse"

Table 3

Parameters of discharge experiments"

组别电极类型放电参数
a单点电极1个脉冲
b单点电极10 kHz，10个脉冲
c同轴电极10 kHz，10个脉冲
d单点电极16 kHz，10个脉冲
e同轴电极16 kHz，10个脉冲

Fig.12

Image of coaxial electrode"

Fig.13

Images of NPD under different electrode types and discharge parameters"

Fig.14

In-chamber pressure under different discharge sets"

Fig.15

NCHR under different discharge sets"

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