主要规格及技术指标

I. Technical Specifications
1. Nozzles are available in two forms: converging and diverging. Nozzle diameter is 4±0.2mm. For converging nozzles: the internal contraction section curve satisfies the Vitósinski profile equation. For Laval nozzles: it satisfies the Laval nozzle variable cross-section one-dimensional steady isentropic flow model.
2. Operating Environment: Normal temperature and pressure. Power Supply: Three-phase five-wire 380V±10%, 50Hz, 4KW power. Safety Protection: Includes grounding protection, leakage protection, and overcurrent protection.
3. Power and Control Line Installation: Environmentally friendly flame-retardant electrical wiring ducts must be used, properly organized and conforming to national standards. Wiring should be insulated, arc-proof, flame-retardant, and self-extinguishing. Wiring should be neat, reliable, and easy to locate, maintain, and replace.
4. Device Dimensions: 2700×600×1750mm.

II. Main Configuration and Parameters
1. Nozzle Body: 304 stainless steel.
2. Pressure stabilizing tank: 304 stainless steel, Ф350*800mm.
3. Acrylic glass converging nozzle and acrylic glass diverging nozzle: φ60×60mm.
4. One water ring vacuum pump: Pump head material: cast iron, pressure limit 3300pa, speed: 1450 rpm, pumping rate: 3.83 m³/min, power: 5.5 kW.
5. Two vacuum pressure gauges: accuracy 0.4 grade, measuring range: -0.1～0MPa, connection thread: M20×1.5.
6. One orifice plate flow meter: high accuracy: ±0.075%, high stability: better than 0.1%FS/year, high static pressure: 40MPa, continuous operation for 5 years without calibration.
7. One U-shaped differential pressure gauge: ±5000mm.
8. Probe: 304 stainless steel, minimal vibration during experiments. 9. Pressure probe: M12×165mm, equipped with a graduated scale, scale range 2-0-8, imported current collector.
10. Two regulating valves: DN50.
11. Forward and reverse stepper motor: Speed: 10r/min, Power: 14W, Frequency: 50HZ, Voltage: 220V.
12. Water tank: 500×500×1520mm, high-temperature resistant ABS material, diameter 60mm, wall thickness 10mm.
13. Power control system: Composed of one double-sided matte textured powder-coated electrical control box, voltmeter (range 0～450V), leakage protector (Delixi), illuminated self-locking push-button switch (Chint), cable trays, etc. The control box panel is made of aluminum recessed lettering.
14. Stainless steel frame experimental table (30*30mm stainless steel square tube, equipped with casters all-purpose wheels with locking feet). 14. Provide experimental reports and test samples (as debugging and acceptance standards), etc.

一.技术指标
1.喷管有渐缩和渐扩两种形式，喷管直径4±0.2mm, 渐缩喷管：内部收缩段曲线满足维托辛斯基型线方程。拉伐尔：满足拉伐尔喷管变截面一维定常等熵流动模型。
2.工作环境：常温、常压。工作电源：三相五线380V±10%、50Hz，功率4KW，安全保护：具有接地保护，漏电保护，过流保护。
3.电源线路及控制线的安装：须使用环保阻燃电气配线槽，规范整理符合国家标准，具有绝缘、防弧、阻燃自熄等特点，布线整齐，安装可靠，便于查找、维修和调换线路。
4.装置外形尺寸：2700×600×1750mm。

二.主要配置及参数
1.喷管本体：304不锈钢材质。
2.稳压罐：304不锈钢材质，Ф350*800mm。
3.有机玻璃渐缩喷管、有机玻璃渐扩喷管：φ60×60mm。
4.水环真空泵1台：泵头材质：铸铁、承限压力3300pa、转速：1450转/分钟、抽气速率：3.83m3/min，功率：5.5Kw。
5.真空压力表2只：精度0.4级，测量范围：-0.1～0MPa，连接螺纹：M20×1.5。
6.孔板流量计1套：高精度：±0.075%，高稳定性：优于0.1%FS/年，高静压：40MPa，连续工作5年不需调校。
7.U型差压计1套：±5000mm。
8.探针：304不锈钢材质，实验时抖动轻微。探针位移装置：测压探针：M12×165mm，配有刻度标尺，刻度范围2-0-8，进口集流器。
9.调节阀门2个：DN50。
10.正反转步进电机：转速：10r/min，功率：14W，频率：50HZ，电压：220V。
11.水箱：500×500×1520mm，耐高温的ABS材质，直径60mm，壁厚10mm。
12.电源控制系统：双面亚光密纹喷塑电控箱1只、电压表（量程范围0～450V）、漏电保护器（德力西）、带灯自锁按钮开关（正泰）、线槽等组成，控制箱面板采用铝质凹字技术制作。
13.不锈钢框架实验台（30*30mm不锈钢方管、配脚轮均为万向轮带禁锢脚）。
14.提供实验报告测试样本（作调试验收标准）等。

主要功能及特色

Device Functions:
1. Used in the "Observation of Nozzle Critical State" experiment in the course Engineering Thermodynamics.
2. Demonstrate the changing laws of nozzle pressure and flow rate, and observe the phenomena of critical pressure and maximum flow rate.
3. Calculate flow rate and the ratio of back pressure to outlet pressure.

装置功能：
1.用于工程热力学教学中"喷管临界状态的观察"实验。
2.演示喷管压力流量的变化规律，并观察临界压力和最大流量的现象。
3.计算流量，背压与出口压力比值。

主要附件及配置

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