ENGR2156
GK's Jet Engine Assignment IV
About
For assignment IV we have to design analyze and find our best concept and create three modules. Below I will guide you through my thinking process and how I came to my choice of modules.
Problem Statement
To improve the design of my jet engine and to make it self-sustain by changing the design of the compressor section by using a centrifugal compressor.
Compressors Available
There are several different types of compressors available in the market we have to know what they are. Below is the basic explanation on what they are and how they work.
1. Axial Compressor In an axial compressor the flow of air is parallel to the axis of rotation. It is composed of multiple rotors and stators. The Rotors are connected to the rotating shaft that rotate at high speed due to the energy regeneration component of the engine. The Stators are parts that are fixed in place to improve the pressure by reducing the spiraling of air around the axisand making them move parallel to the axis. This improves the flow of air in the compressor section. Axial Compressors are used in many Jet Engines that we fly on. Almost all Passenger jets use Jet Engines that have an axial Compressor.
Source: https://airandspace.si.edu/collection-objects/general-electric-j85-ge-17a-turbojet-engine-cutaway
FRDPARRC Table Concept 1
2. Centrifugal Compressor Unlike an axial compressor, a centrifugal compressor turns the flow of air perpendicular to the axis of rotation. Centrifugal compressors were used in the first jet engine and are still used in Turbo-Jets and Turbo-Shaft Engines. They are also used in turbo charges that we have on cars and trucks. The blades are designed differently when compared to an axial compressor. Usually there is only one stage and that is a big advantage on minimizing expensive materials but compromises simplicity. Below is a picture of a centrifugal compressor.
Source: http://www.mech4study.com/2017/11/centrifugal-compressor.html
FRDPARRC Table Concept 2
3. Combination of axial and Centrifugal Compressor This is a more complicated design where we combine both an axial and a centrifugal compressor. Usually the axial compressor is placed in front of the centrifu- gal compressor with both running at different rpms. The axial compressor is run at a lower rpm than the centrifugal compressor.
Combination of both Axial and Centrifugal Compressor
Source: https://aircraftengineering.wordpress.com/tag/compressor/
FRDPARRC Table Concept 3
Decision Matrix
Since we have different types of compressors available, we have to pick on that is best suited for our needs based on our specific requirements. Below I have used a decision matrix to pick my best choice.
We can see that the Centrifugal Compressor is a clear winner here. It is a little more complicated to design than an Axial Compressor, but it gives much more positives outcomes than negatives. Below are the CAD models of the compressors that I made using Creo Parametric and used Modelo to display an interactive model. You will also see the dimensions of the above that I have planned for. You may also download the model to be viewed on your computer.
POWER CALCULATIONS
My Designs of these Concepts
1. Axial Compressor Here is the design of the Axial Compressor I made using creo. You may also download the model using the link below and it will contain the parts and assembly with the drawings for all the parts. My Axial Compressor contains 3 rotors and 3 stators which are fixed to the case.
Below you can see a cut away of my Axial Compressor that I made using CREO.
2. Centrifugal Compressor (My Choice) The Centrifugal Compressor is my choice since it satifies my needs and is much cheaper to make material wise. It also reduces the number of parts to one spinning compressor and a case that hold's it in place and the shaft that holds the compressor. Below you can see my design of the Centrifugal Compressor. I made the model using CREO and you may download it us
Below you can see a cut away of my Centrifugal Compressor that I made using CREO. Just looking at it, will tell you how much easier it would be compared to the Axial Compressor.
This is what it will look like with an exploded view.
Download For CENTRIFUGAL COMPRESSOR
• Gantt Chart
Work Cited
Hall, Nancy. Compressors, Glenn Research Center. NASA. Updated May 05, 2015. Web: https://www.grc.nasa.gov/www/k-12/airplane/compress.html Hall, Nancy. Axial Compressors, Glenn Research Center. NASA. Updated May 05, 2015. Web: https://www.grc.nasa.gov/www/k-12/airplane/caxial.html Hall, Nancy. Centrifugal Compressors, Glenn Research Center. NASA. Updated May 05, 2015. Web: https://www.grc.nasa.gov/www/k-12/airplane/centrf.html Dr. Terence J Fagan. Decision Matrix. UNC Charlotte. Web: online document shared with students in MEGR 2156. Compressor. Perdue Engineering. Web: https://engineering.purdue.edu/~propulsi/propulsion/jets/basics/comp.html
Time Report
10:00 to 11:00 (03/16/19) – Problem Statement and Assumptions 10:50 to 12:20 (03/17/19) – Decision Matrix 12:20 to 16:10 (03/17/19) – Multiple Solution explanation 09:30 to 11:00 (03/23/19) – Learning about Power Calculation 11:15 to 12:45 (03/25/19) – Website Creation 12:45 to 17:00 (03/23/19) – CAD 18:00 to 23:00 (03/23/19) - CAD Continued 10:00 to 14:00 (03/24/19) – Website Creation Continued
Lessons Learned
1. Power calculations for compressors 2. Different ways to set up a compressor 3. Learned to not take calculations easy 4. Advantages of higher pressure in Jet engines 5. How to assemble in CAD
• Comment to advisees 1. Connor Rice : (https://webpages.uncc.edu/crice36/assignment_4.html) Overall Your website looks good and I really like the way you designed your CAD model. Your render looks really nice. The only thing I would have done was to center some of those images and that would make a big difference appearance wise. you can do that by using: p "style="text-align: center" within "<>". 2. Nicole Cassada (https://webpages.uncc.edu/ncassada/Assignment4.html) I like the way you present your work. It looks like you have included everything on your webpage as per requirement. I like your CAD models. This is an area where I like to work in the future and I really like your designs.
