【摘要】：基于裝置各部件固有頻率相等的方法,設(shè)計(jì)制作了一種在平面聲腔側(cè)壁離散對(duì)稱布置16極Helmholtz聲源的實(shí)驗(yàn)裝置,研究了平面聲腔內(nèi)由16極Helmholtz聲源構(gòu)造的復(fù)合聲場(chǎng)及其對(duì)顆粒的操縱特性.通過理論和實(shí)驗(yàn)研究了Helmholtz聲源的頻率特性、平面聲腔的諧振特性、平面聲腔內(nèi)復(fù)合聲場(chǎng)的時(shí)空變化特性以及復(fù)合聲場(chǎng)對(duì)平面聲腔內(nèi)充注的煙氣顆粒操縱的有效性.結(jié)果表明:運(yùn)行頻率為1.805 k Hz時(shí),16極Helmholtz聲源耦合的平面聲腔能夠?qū)崿F(xiàn)同步諧振;平面聲腔內(nèi)形成了聲壓幅度逐漸衰減的環(huán)形復(fù)合聲場(chǎng);煙氣顆粒被聚集在靠近壁面約0.5個(gè)波長(zhǎng)的環(huán)形區(qū)域內(nèi),在平面聲腔的中部形成了無顆粒區(qū),顆粒聚集區(qū)與無顆粒區(qū)的面積比約為16∶9.
[Abstract]:Based on the method of equal natural frequency of each part of the device, an experimental device is designed and fabricated, in which a 16-pole Helmholtz sound source is dispersed and symmetrically arranged on the side wall of the plane acoustic cavity. The composite acoustic field constructed by a 16-pole Helmholtz sound source in a plane acoustic cavity and its maneuvering characteristics on particles are studied. The frequency characteristics of the Helmholtz sound source, the resonance characteristics of the plane sound cavity, the spatio-temporal variation of the composite sound field in the plane sound cavity and the effectiveness of the composite sound field on the control of the smoke particles filled in the plane sound cavity are studied theoretically and experimentally. The results show that when the operating frequency is 1.805 k Hz, a planar cavity coupled with a 16-pole Helmholtz sound source can achieve synchronous resonance, and a ring compound sound field with gradual attenuation of sound pressure amplitude is formed in the plane cavity. The smoke particles are concentrated in an annular region with about 0.5 wavelengths near the wall, and a particle-free zone is formed in the middle of the plane acoustic cavity. The area ratio of the particle aggregation area to the non-particle area is about 16 ~ 9.
【作者單位】： 東南大學(xué)能源與環(huán)境學(xué)院;東南大學(xué)能源熱轉(zhuǎn)換及其過程測(cè)控教育部重點(diǎn)實(shí)驗(yàn)室;
【基金】：中央高校基本科研業(yè)務(wù)費(fèi)專項(xiàng)資金資助項(xiàng)目(3203005101) 江蘇省普通高校研究生科研創(chuàng)新計(jì)劃資助項(xiàng)目(KYLX15_0069)
【分類號(hào)】：TB5

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