23 Nov Ejector Design Calculation Pdf Download ((FULL))
Ejector Design Calculation Pdf Download
joel crawmer, chien-hua chen, bradley richard, howard pearlman, paul ronney. thomas edwards 2018 essci swiss-roll jp-8 fuel reformer with direct center fuel injection and mixing chamber design. spring technical meeting eastern states section of the combustion institute. state college, pennsylvania.
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the current design and content of the curriculum reflects changes in machining technologies, emerging cutting tool trends and innovations in the metal working industry. selected new tools, geometries and coating technologies are demonstrated in m-vec for educational purposes prior to their official commissioning and are modified upon customers requests.
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the first ejectors were developed in the 1880’s by one of my forefathers, dr. alexander pritchard. he developed the pritchard ejector and the pritchard split ejector in the 1880’s. these ejectors have a design value of about 50 in a 30-inch pipe, they are considered to be the pioneer ejectors. the pritchard split ejector was a slightly modified design, and he used the term “pritchard” for both. the pritchard ejector consists of a large pipe with a conical nozzle in the end with a small hole in the bottom. it has an entrance slot in the pipe that is just large enough for the small hole in the bottom of the nozzle. these ejectors were very small and were used in many industries, but they were designed for the generation of the steam to drive the turbines. the steam had to be very pure and very clean, and also, it had to be of the correct pressure. the pritchard split ejector was developed for the same conditions. the split ejector made the steam from the water at the bottom of the pipe, and it ejected it up the pipe to the top and, of course, the upper part of the pipe was its own feed tank. when it ejected, it formed a shell around the inner side of the nozzle. the steam was very pure, it was not contaminated at all with other gases, and the steam pressure was about 1.6 mpa. the actual pressure to drive the turbine was about 2.5 mpa. the split ejector was designed for the generation of steam to drive a steam turbine. in the 1920’s and 1930’s, the reaction gas ejector was developed in this country. this ejector was a patented invention that is in use today.
In most cases, the basic units of performance for the ejector are the impulse for each cell, and the power of the driving pump. Impulse is defined as the product of the mass flow rate of the driving flow and the area through which flow occurs. If the area is divided into n discrete cells, then the impulse is the product of the mass flow rate of the driving flow and the total area of the cells (impulse=mass flow rate of driving flow*cell area). Power is the product of the velocity of the driving flow at the entrance and exit areas of the cells (power=velocity of flow in the entering cell area*area of the cell where flow enters and exits).
The exit conditions are affected by the exit to inflow (EOI) ratios (l/l) and the transverse exit velocity (u’). Exit flow rates are commonly adjusted by designing the overall ejector for a set flow rate of the driving flow. The inflow conditions at the inlet are the ratio of the inlet velocity to the secondary flow velocity (i/u). Note that the flow conditions are defined in the local coordinate system of the cell and not globally. These ratios must be computed for each cell individually.
The performance of the ejector is expressed as the impulse-to-power ratio (IPR). The IPR is the product of the impulse and the power. The power is the product of the pressure of the driving flow (P) and the area (A) over which the driving flow impinges, which equals the flow-surface product (SF). This product can be expressed as: SF=P*A. It is now possible to rewrite the IPR as:
For example, if the pressure of the driving flow in the inlet of the cells is 1bar, and the exit flow rate (if not controlled) is 100 m3/h (that is the I/U ratio is 0.1), the P/A ratio is always unity, hence the IPR is the product of the impulse and power. IPR can also be seen as the product of the impulses and driving flow rates of individual cells in the ejector.