水下自激吸氣式射流裝置沖擊力時(shí)頻特性分析
發(fā)布時(shí)間:2018-01-21 22:34
本文關(guān)鍵詞: 水下 自激吸氣 射流 沖擊力 時(shí)頻特性 出處:《振動與沖擊》2016年24期 論文類型:期刊論文
【摘要】:利用水下射流循環(huán)試驗(yàn)系統(tǒng)對水下自激吸氣式射流裝置進(jìn)行了沖擊試驗(yàn),得到了裝置吸氣和不吸氣條件下沖擊力時(shí)域波形,運(yùn)用第二代小波變換和Wigner-Ville分布相結(jié)合的方法提取了沖擊力時(shí)頻特性,研究了裝置吸氣和不吸氣條件以及不同圍壓和靶距下沖擊力頻帶能量分布規(guī)律。結(jié)果表明,存在最優(yōu)下噴嘴直徑使裝置的沖擊力時(shí)域特征參數(shù)最佳;裝置沖擊力能量主要集中在低頻帶,且圍壓、靶距和吸氣對頻帶能量比影響較大;吸氣對裝置沖擊力頻率成分、能量密度分布和脈沖效果均有明顯影響,而圍壓和靶距只對能量密度分布和脈沖效果影響較大;碰撞體測點(diǎn)壓力反映了裝置聚能和釋能的狀態(tài)且與沖擊力能量密度分布存在著對應(yīng)關(guān)系。
[Abstract]:In this paper, the impact test of underwater self-inspiratory jet device is carried out by using the underwater jet cycle test system, and the time-domain waveform of the impact force is obtained under the condition of suction and non-suction of the device. The time-frequency characteristic of impact force is extracted by combining the second generation wavelet transform with Wigner-Ville distribution. The conditions of suction and non-suction of the device and the energy distribution of the impact force band under different confining pressure and target distance are studied. The results show that the existence of the optimum nozzle diameter makes the time domain characteristic parameters of the impact force the best. The impact energy of the device is mainly concentrated in the low frequency band, and the confining pressure, the target distance and the inspiratory energy ratio have great influence on the frequency band energy ratio. Inspiratory has obvious influence on the frequency component, energy density distribution and pulse effect of the device, while confining pressure and target distance only have great influence on the energy density distribution and pulse effect. The pressure at the point of impact body reflects the state of the device's accumulated energy and energy release and has a corresponding relationship with the energy density distribution of the impact force.
【作者單位】: 華北水利水電大學(xué)電力學(xué)院;
【基金】:國家自然科學(xué)基金項(xiàng)目(51309099)
【分類號】:O358
【正文快照】: 研究表明水射流引入氣體可以明顯改善其沖擊性能[1-4]。水下自激吸氣式射流裝置是在自激脈沖射流和氣液射流研究基礎(chǔ)上提出的一種新型射流裝置,它通過在裝置腔體上布置吸氣孔,利用一定的工作壓力可以使裝置自吸氣,氣體在腔內(nèi)與水充分混合后,在下噴嘴出口形成水氣射流,在前期工
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