【摘要】：針對(duì)用于噴墨打印的圓管式壓電噴頭建立了計(jì)算模型,并且根據(jù)它的驅(qū)動(dòng)特點(diǎn)選擇了合適的邊界條件。介紹了仿真軟件針對(duì)自由表面流動(dòng)問題的計(jì)算原理。然后,以乙二醇水溶液為例,計(jì)算了壓電噴頭分配該溶液的分配過程;利用液滴成像系統(tǒng)獲取了不同時(shí)刻的液滴圖像,驗(yàn)證了建立的模型和數(shù)值算法的正確性。最后,計(jì)算了壓電噴頭在不同輸入位移、不同黏度以及不同表面張力下的液體分配過程。仿真結(jié)果顯示:液體分配性能與激勵(lì)位移密切相關(guān),在72.5mN/m的表面張力作用下,10nm的輸入位移很難分配黏度為4.0mPa·s的液體,而15nm的輸入位移在分配黏度為4.0mPa·s液體時(shí)卻能夠產(chǎn)生衛(wèi)星液滴。因此,對(duì)于某種液體尋找一個(gè)合適的激勵(lì)條件非常重要,過小的激勵(lì)產(chǎn)生不了液滴,過大的激勵(lì)則會(huì)產(chǎn)生較大甚至多個(gè)衛(wèi)星液滴;增大黏度會(huì)延緩或阻滯液滴形成過程,增大表面張力卻能加快液滴形成過程。本文的計(jì)算方法對(duì)于研制新式噴頭或者研究噴頭的噴射能力均具有指導(dǎo)意義。
[Abstract]:The calculation model of the tubular piezoelectric nozzle used for inkjet printing is established, and the appropriate boundary conditions are selected according to its driving characteristics. The principle of simulation software for free surface flow is introduced. Then, the distribution process of the solution is calculated by taking the ethylene glycol aqueous solution as an example, and the droplet images at different times are obtained by using the droplet imaging system, which verifies the correctness of the established model and the numerical algorithm. Finally, the liquid distribution process of piezoelectric nozzle under different input displacement, different viscosity and different surface tension is calculated. The simulation results show that the performance of liquid distribution is closely related to the excitation displacement. Under the action of surface tension of 72.5mN/m, the input displacement of 10nm is difficult to distribute the liquid with viscosity of 4.0mPa s. The input displacement of 15nm can produce satellite droplets when the viscosity is distributed to 4.0mPa s liquid. Therefore, it is very important for a certain liquid to find a suitable excitation condition, too small an excitation can not produce droplets, too large an incentive will produce larger or more satellite droplets; increasing viscosity will delay or block the formation of droplets. Increasing surface tension can accelerate the droplet formation process. The calculation method in this paper is of guiding significance for the development of new nozzle or the study of spray capability of nozzle.
【作者單位】： 哈爾濱工業(yè)大學(xué)機(jī)器人技術(shù)與系統(tǒng)國家重點(diǎn)實(shí)驗(yàn)室;
【基金】：國家自然科學(xué)基金資助項(xiàng)目(No.51105116) 中央高�；究蒲袠I(yè)務(wù)費(fèi)專項(xiàng)資金資助項(xiàng)目(No.HIT.IBRSEM.2013038)
【分類號(hào)】：TN384;O35
，

本文編號(hào)：2281130