Steam jet compressors (heat pumps) and gas ejectors (steam ejectors): various calculation methods and designs
Thread Content
This post was last edited by jklsg123 on 2012-4-1 23:18. Jet heaters: steam-jet type and water-jet type. Currently, the steam-jet type is mostly used, but in some cases the water-jet type is required. There is no formula for the water-jet type; experiments must be conducted before it can be applied. Such algorithms are also different from the algorithms of the American Heat Exchanger Association. The main issue to be addressed is noise, and the core of the design lies in shock waves. Simulation systems can certainly address this issue to a large extent, but empirical formulas are still needed.
Reply to 2# Pigs are also treasures. If calculation is needed, you can send over the parameters!
Welcome to my blog: http://xtkjd.blog.163.com, where you can find a range of injector devices manufactured by us.
Welcome to my blog: http://xtkjd.blog.163.com, which features a range of ejector devices
Not bad; I hope to see the original poster’s summary of previous formulas and an analysis of their advantages and disadvantages. The Mollie diagram mentioned by the original poster is actually a entropy-enthalpy diagram for steam; it indeed represents a relatively simple and feasible method of calculation. It assumes that both the nozzle and the pressure-boosting tube operate under isentropic conditions, and then the isentropic efficiency is applied. There are examples of such calculations in textbooks on chemical thermodynamics, but these methods rely on many empirical parameters. There are several other formulas designed for saturated superheated steam, and the results obtained using these formulas vary. I look forward to seeing the original poster’s comparison of these methods – but at the end of the day, they all stem from the formulas related to the speed of sound and the calculations for supercritical flow
This post was last edited and replied to by jklsg123 on 2012-4-1 23:17. Reply 7# dawnchuck: Of course, at present the ejector can have its injection coefficient calculated based on real gases; in other words, several velocity coefficients change depending on the working conditions, rather than being the constant velocity coefficients shown in the formulas.
There are very few literature sources on the design calculations for ejectors that use natural gas to eject liquids, and no standards exist either. Are there any methods available? If you know anyone, please help!
Hello, I am interested in low-pressure steam ejectors with a pressure of only 0.2~0.3 MPa