Transient characteristics during pulse operation of liquid feed line for the attitude control rocket engine 姿控發(fā)動(dòng)機(jī)脈沖工作的管路瞬變特性
Laser diode pumped solid - state laser ( dpssl ) is an important branch in laser field . continuous wave and pulse operation , q - switching and mode - locking operation have been achieved for dpssl which have a lot of uses in the field of medicine , process and so on Ld泵浦的全固態(tài)激光器( laserdiodepumpedsolid - statelaser或dpssl )是激光技術(shù)領(lǐng)域的一個(gè)重要分支,與傳統(tǒng)激光器相比在重量、體積、電?光轉(zhuǎn)換效率、使用壽命和穩(wěn)定性方面更具優(yōu)越性。
Water dielectric pulse power modulator has been widely applied because of its merits of high energy storage density , compactness , and capability to drive low impedance high power microwave sources . research for multi - pulse operation of high power spark gap switch with high current and comprehending its physical properties are the basis to study multi - pulse operation or repetitive operation of water dielectric pulse power modulator 水介質(zhì)脈沖功率調(diào)制器具有儲(chǔ)能密度高,結(jié)構(gòu)緊湊、與低阻抗微波源較好匹配的特點(diǎn),因此得到廣泛的應(yīng)用,但是受到高功率、大電流氣體開關(guān)的絕緣恢復(fù)的影響,水介質(zhì)等低阻抗脈沖功率調(diào)制器的重復(fù)頻率運(yùn)行或多脈沖運(yùn)行受到較大的限制。
All analysis and simulations results indicate several methods improving the insulation recovery of spark gap switch : ( 1 ) using the gas with good thermal conductivity , such as h2 and sf6 ; ( 2 ) using the gas flow ; ( 3 ) utilizing the v / p cure ; ( 4 ) modifying the geometry and size of the electrode ; ( 5 ) using the gas with good electronegativity , such as sf6 . some experiments on the multi - pulse operation of high power spark gap switch are carried out . the insulation recoveries of switch without and with gas flow are both investigated 結(jié)合理論分析和模擬結(jié)果,提出了氣體火花開關(guān)多脈沖運(yùn)行特性可采用如下方法: ( 1 )使用導(dǎo)熱性能好的氣體,如h2 、 sf6等; ( 2 )采用吹氣的方法; ( 3 )增大氣壓,在電極表面增加細(xì)小結(jié)構(gòu),構(gòu)造平穩(wěn)的v / p曲線; ( 4 )改良開關(guān)電極結(jié)構(gòu)和尺寸,采用奶頭-半球結(jié)構(gòu)的電極; ( 5 )使用電負(fù)性強(qiáng)的氣體作為開關(guān)絕緣氣體,如sf6 。
The results provide a theoretic basis to research the multi - pulse operation of high power spark gap . as the breakdown mechanism is concerned , the influence of rough electrode on the v / p ( switch breakdown voltage / gas pressure ) curve is analyzed originally using breakdown possibility . the requirements of flat v / p curve are presented , which provides a theoretical basis for controlling and utilizing the curve 對(duì)氣體火花開關(guān)的擊穿機(jī)理,創(chuàng)新的利用擊穿概率分析了粗糙電極對(duì)氣體火花開關(guān)v / p曲線影響的物理機(jī)制,給出了利用細(xì)小結(jié)構(gòu)構(gòu)造平穩(wěn)v / p (開關(guān)擊穿電壓/氣體壓強(qiáng))曲線的條件,為實(shí)驗(yàn)中控制和利用該曲線提高氣體火花開關(guān)的多脈沖運(yùn)行能力提供了理論基礎(chǔ)。