A Model of Micro Electro-Discharge Machining Plasma Discharge in Deionized Water
A Model of Micro Electro-Discharge Machining Plasma Discharge in Deionized Water
复制标题
DOI：
10.1115/1.4026298
复制
发表时间：
2014-06
影响因子：
4
通讯作者：
Soham Mujumdar;D. Curreli;S. Kapoor;D. Ruzic
中科院分区：
文献类型：
--
作者：
Soham Mujumdar;D. Curreli;S. Kapoor;D. Ruzic
为了成功地将L-电火花加工工艺商业化应用，有必要通过了解加工机理来提高加工效率。本文给出了去离子水中单次放电L-电火花加工事件的等离子体放电相模型。等离子体放电采用整体模型方法，假定等离子体在空间上是均匀的，同时求解质量守恒方程和能量守恒方程以及等离子体气泡的生长动力学。在给定输入放电电压、电流和放电间隙的情况下，得到了L电火花加工等离子体在放电过程中的等离子体成分、电子温度、等离子体泡半径和等离子体压力的完整的时间描述。当输入电场为10~2000 mV/m，放电间隙为0.5~20lm时，时均电子密度为3：8810m~3 30：3310m~3，时均电子温度为11013~29864K。根据文献中的光谱数据对实验条件进行了模拟和验证。该模型的输出可用于计算L电火花加工过程中传递到电极上的热流密度。[DOI：10.1115/1.4026298]
For successful commercial adaptation of the l-EDM (micro electro-discharge machining) process, there is a need to increase the process efficiency by understanding the process mechanism. This paper presents a model of the plasma discharge phase of a single discharge l-EDM event in deionized water. The plasma discharge is modeled using global model approach in which the plasma is assumed to be spatially uniform, and equations of mass and energy conservation are solved simultaneously along with the dynamics of the plasma bubble growth. Given the input discharge voltage, current and the discharge gap, complete temporal description of the l-EDM plasma during the discharge time is obtained in terms of the composition of the plasma, temperature of electrons and other species, radius of the plasma bubble and the plasma pressure. For input electric field in the range of 10–2000 MV/m and discharge gap in the range of 0.5–20 lm, timeaveraged electron density of 3:88 10m 3 30:33 10m 3 and time-averaged electron temperature of 11,013–29,864 K are predicted. Experimental conditions are simulated and validated against the spectroscopic data from the literature. The output from this model can be used to obtain the amount of heat flux transferred to the electrodes during the l-EDM process. [DOI: 10.1115/1.4026298]