A method of calculation for the ejector design using the correlations is also developed. R141b is shown in the present study to be a good working fluid for an ejector. The measured ω for the ejectors used in the present study can reach as high as 0.54 at Pg = 0.465 MPa (84 °C), Pc. = 0.087 MPa (28 °C) and Pe = 0.040 MPa (8 °C). Gas Ejector Modeling for Design and Analysis. (December 2008) Chaqing Liao, B.S., Zhejiang University; M.E., Texas A&M University Chair of Advisory Committee: Dr. Best A generalized ejector model was successfully developed for gas ejector design and performance analysis. How to program 2009 mini cooper key fob. Previous 1-D analytical models can be derived from this new. Ezejector now offers a program for design of multi stage steam ejectors. Contact us if you are interested in this software. See below an example of design development. The overall compression ratio required.
Library
Pumps and Motors
Description
The Jet Pump block represents a jet liquid-liquidpump consisting of a nozzle, throat, and diffuser, as shown in thefollowing illustration.
The model is based on the following equations, described in[1]:
(1) |
(2) |
(3) |
where
q1 | Primary flow rate pumped through the nozzle |
q2 | Secondary flow rate |
qd | Output flow rate |
p1 | Pressure at the nozzle inlet |
p2 | Pressure at the secondary flow rate inlet |
p0 | Pressure at the throat inlet |
pd | Pressure at the pump outlet |
An | Nozzle area |
Ath | Throat area |
a | Diffuser area ratio, Ath / Ad |
Ad | Diffuser outlet area |
Kn | Nozzle hydraulic loss coefficient |
Ken | Throat entry hydraulic loss coefficient |
Kth | Throat hydraulic loss coefficient |
Kdi | Diffuser hydraulic loss coefficient |
ρ | Fluid density |
Equation 1 describesthe nozzle, Equation 2 –throat entry, and Equation 3 –the combination of the throat and the diffuser. The equations correspondto a standard configuration of the pump, where all the longitudinaldimensions conform to established, empirically determined values.For more details, see [1].
The pump parameters are closely related to each other, and themethodology described in [1]is recommended to determine their initial values.
Basic Assumptions and Limitations
- The model is based on the one-dimensional theory.
- The primary and secondary flows enter the mixing throatwith uniform velocity distribution, and the mixed flow leaves thediffuser with uniform velocity distribution.
- The fluid in the primary and secondary flows is thesame.
- The fluid is assumed to be incompressible and containingno gas.
Parameters
Cross-sectional area of the nozzle. The parameter must be greaterthan zero. The default value is
1
cm^2.Cross-sectional area of the throat. Heidelberg gto parts manual. The throat area is usuallytwo to four times larger than the nozzle area. The default value is
4
Film impact transition pack 1 full download. cm^2.The ratio between the inlet and outlet diffuser areas. For astandard pump with a 5° – 7° included-angle diffuser,the ratio is close to 0.2. The parameter must be greater or equalto zero. The default value is
0.224
.The hydraulic friction loss coefficient in the nozzle. The parametermust be greater than zero. The default value is
0.05
.The hydraulic friction loss coefficient in the throat entry.The parameter must be greater than zero. The default value is
0.005
.The hydraulic friction loss coefficient in the throat. The parametermust be greater than zero. The default value is
0.1
.The hydraulic friction loss coefficient in the diffuser. Theparameter must be greater than zero. The default value is
0.1
.Global Parameters
Parameters determined by the type of working fluid:
Use the Hydraulic Fluid blockor the Custom Hydraulic Fluid blockto specify the fluid properties.
Ports
Torrent janome digitizer pro download. The block has the following ports:
A
Hydraulic conserving port associated with the nozzle entry (primaryflow entry).
S
Hydraulic conserving port associated with the pump suction (secondaryflow entry).
P
Hydraulic conserving port associated with the pump outlet.
N
Internal nonvisible hydraulic conserving port associated withthe throat entry section of the pump. You can view the variables associatedwith the port by logging simulation data. For more information, see Data Logging (Simscape).
Examples
The Well withJet Pump example represents a well jet pump installation,consisting of a surface-mounted centrifugal pump and a jet pump installedin the well below water level.
References
[1] I.J. Karassic, J.P. Messina, P. Cooper, C.C. Heald, PumpHandbook, Fourth edition, McGraw-Hill, NY, 2008
Extended Capabilities
C/C++ Code Generation
Generate C and C++ code using Simulink® Coder™.
Ejector Design Calculation Software 2017
See Also
Ejector Design Calculation Software Pdf
Centrifugal Pump | Fixed-Displacement Pump | Variable-DisplacementPressure-Compensated Pump | Variable-DisplacementPump