Bhuvan Aerospace
Junior Member
Making BTS-3 Turbojet Engine.
Joined: August 2024
Posts: 95
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Post by Bhuvan Aerospace on Oct 12, 2024 6:29:09 GMT -5
Anyone tell me how to do nuclear fission?
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Bhuvan Aerospace
Junior Member
Making BTS-3 Turbojet Engine.
Joined: August 2024
Posts: 95
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Post by Bhuvan Aerospace on Oct 14, 2024 1:02:31 GMT -5
Sir, My Engine is now 90% completed (I delayed it because the parts store near our house was closed due to Durga Puja Festival). But sir, I decided that I will convert that little engine to a turboshaft engine. That's why I was calculating the output horsepower and how much electricity it will produce. I took the help of ChatGPT, but it gave me very dangerous results. It told me that it will produce a minimum of 10 horsepower and it will produce 7.5 kW of Electricity. Is that true sir? Or ChatGPT is malfunctioning? Here are some screenshots to help you understand. To estimate the horsepower produced by a turboshaft engine based on thrust, we can use the following relationship: Power (W)=Thrust (N)×Velocity (m/s) To convert power in watts to horsepower, we use the conversion: 1HP≈746W Calculation Steps Thrust: Given thrust is 25N. Velocity: We need the velocity at which this thrust is being produced. For a turboshaft engine, typical exhaust velocities can range from 200 to 400 m/s. Let's assume an exhaust velocity of 300 m/s for this calculation. Calculate Power: Power=Thrust×Velocity=25N×300m/s=7,500W Convert to Horsepower: Horsepower=7,500W/746 ≈10.04HP Conclusion With a thrust of 25 N and an assumed exhaust velocity of 300 m/s, the 20mm inducer turboshaft engine would produce approximately 10.04 horsepower and it will produce 7.5 kW and 6.75 kW if the generator has 90% efficiency. I assumed it as 5 HP instead of 10 HP. When propellers are added to the Turboshaft engine, To estimate the thrust produced by a turboshaft engine with an output of 5 horsepower when propellers are added, we can use the following relationship between power, thrust, and velocity. Basic Formula The formula to estimate thrust (T) based on power (P) and velocity (V) is: T=P/V Where: T = Thrust (in Newtons) P = Power (in watts) V = Velocity (in m/s) Conversion of Horsepower to Watts First, we need to convert horsepower to watts: 1HP≈746W 5HP=5×746W=3,730W Thrust Calculation Next, we need to estimate the velocity of the propeller airflow. For small propellers, a typical operational velocity might range from about 10 to 30 m/s. Let's use an average value of 20 m/s for this calculation. Now we can calculate thrust: T=3,730W/20m/s=186.5 N Conclusion If a turboshaft engine produces 5 HP (about 3,730 W) and is paired with propellers operating at an average velocity of 20 m/s, it would generate approximately 186.5 N of thrust.
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Post by racket on Oct 14, 2024 3:07:50 GMT -5
Too many assumptions in your calculations , also at very small sizes the efficiencies can be very low , virtually impossible to calculate outcomes , don't waste your time .
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Bhuvan Aerospace
Junior Member
Making BTS-3 Turbojet Engine.
Joined: August 2024
Posts: 95
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Post by Bhuvan Aerospace on Oct 14, 2024 3:28:12 GMT -5
Okay sir, but will I get 1kW electricity minimum (just guess sir)?
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Post by racket on Oct 14, 2024 14:50:48 GMT -5
My guess is that you won't even get your engine to run .
Even if you do , you use 100Kw of energy ( fuel) to produce your 1Kw of electricity , no a good return on your investment .
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dieselworks
Member
Working hard on increasing noise and soot pollution levels.
Joined: October 2024
Posts: 10
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Post by dieselworks on Oct 14, 2024 16:51:15 GMT -5
A crudely made piston engine will be dramatically more efficient than a crudely made turbine engine, especially at a small scale. If your goal is a working model airplane, electric motors or miniature 'nitro' engines will give you much better performance.
If you are more interested in making a 'jet engine', you should be prepared for a challenge. It's doable, but you will need to spend some time and money to make something that actually works. You should visit a scrapyard and get a large turbocharger from an old truck. The cost of the fuel system and oil system will be practically the same and you will have a fair chance of being successful at making a running engine.
The really small turbochargers are very finicky.
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Bhuvan Aerospace
Junior Member
Making BTS-3 Turbojet Engine.
Joined: August 2024
Posts: 95
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Post by Bhuvan Aerospace on Oct 14, 2024 23:52:39 GMT -5
Now, after completing this , we are going to make micro turbofan Engine with a thrust of 1-1.5kN.
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Post by racket on Oct 15, 2024 0:50:44 GMT -5
Good luck with that :-)
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Bhuvan Aerospace
Junior Member
Making BTS-3 Turbojet Engine.
Joined: August 2024
Posts: 95
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Post by Bhuvan Aerospace on Oct 15, 2024 1:57:34 GMT -5
Thank you sir ;-) . You will be helping on that too.
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cebaero
Member
Joined: August 2024
Posts: 46
Member is Online
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Post by cebaero on Oct 15, 2024 14:51:17 GMT -5
I love this guy
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Bhuvan Aerospace
Junior Member
Making BTS-3 Turbojet Engine.
Joined: August 2024
Posts: 95
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Post by Bhuvan Aerospace on Oct 16, 2024 0:22:52 GMT -5
Thank you :-) .
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Bhuvan Aerospace
Junior Member
Making BTS-3 Turbojet Engine.
Joined: August 2024
Posts: 95
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Post by Bhuvan Aerospace on Oct 21, 2024 11:34:11 GMT -5
I tested the engine. But the fuel was not ignited inside the combustion chamber even after adding spark plug.
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Post by racket on Oct 21, 2024 16:32:43 GMT -5
Without detailed pics and data of your build its difficult to provide recommendations to fix the problem .
What is your spoolup procedure ??
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Bhuvan Aerospace
Junior Member
Making BTS-3 Turbojet Engine.
Joined: August 2024
Posts: 95
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Post by Bhuvan Aerospace on Oct 21, 2024 23:37:09 GMT -5
Without detailed pics and data of your build its difficult to provide recommendations to fix the problem . What is your spoolup procedure ?? First I started the blower, then released the fuel, then turned on the spark plug. But the fuel was not ignited. I am sending the images on the next post.
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Post by racket on Oct 22, 2024 0:37:59 GMT -5
Checkout my email of the 11 Oct about spoolups , sounds like you are blowing the fuel away from the sparkplug.
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