I'm working on a test bench for thermal exhaust blankets. We would like to test different jacket insulation for an exhaust pipe temperature of 1250 F and a mass flow rate 300 g/s. We usually control the skin temperature of the pipe from the torch flame we set up in the beginning of the pipe without paying attention to the mass flow rate of the exhaust. How can I set up a mass flow rate measurement or control of such high temperature application? Our test bench consist only of a propane tank with a torch that heat up with exhaust the pipe to the temperature we want.
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mass flow rate test bench
- Thread starter albakral
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What are you exhausting from? Can you just measure the mass flow rate at a location upstream from (and cooler than) the test section?
PT
Fudd's First Law of Opposition: "If you push something hard enough, it will fall over."
Teslacle's Deviant to Fudd's Law: "It comes in, it must go out."
PT
Fudd's First Law of Opposition: "If you push something hard enough, it will fall over."
Teslacle's Deviant to Fudd's Law: "It comes in, it must go out."
- Thread starter
- #3
Here are some Eng-Tips threads that may be relevant:
These threads touch on the basis for my question: what are you exhausting from? If you're exhausting an internal combustion engine, why not just determine mass flow rate of exhaust from mass flow rates of air and fuel (i.e., output equals input)?
If you assume a stoichiometric air-fuel ratio, you only need to measure fuel mass flow rate. If assuming a stoichiometric air-fuel ratio is not accurate enough, then measure it with an oxygen sensor in the exhaust (
PT
These threads touch on the basis for my question: what are you exhausting from? If you're exhausting an internal combustion engine, why not just determine mass flow rate of exhaust from mass flow rates of air and fuel (i.e., output equals input)?
If you assume a stoichiometric air-fuel ratio, you only need to measure fuel mass flow rate. If assuming a stoichiometric air-fuel ratio is not accurate enough, then measure it with an oxygen sensor in the exhaust (
PT
- Thread starter
- #5
Thank you for the tips.
We do not have an ICE to help us in the simulation. Budget complication. We are very roughly trying to test our blankets using a propane torch that spit fire inside a pipe. We wrap around the pipe our blanket and with few thermocouples we measure the T outside of the pipe and the T outside skin of the blanket. We obtain the temp drop from the hot side to the cold side. With this method I'm only able to control the temperature of the outside pipe opening or closing the valve of the propane tank. We have been asked to measure the mass flow rate, but in the configuration described I do not have access to it. If you have suggestion on different configuration how to set up the test, it will be great. I'm not sure I can calculate the air-fuel ratio of a propane torch tank
We do not have an ICE to help us in the simulation. Budget complication. We are very roughly trying to test our blankets using a propane torch that spit fire inside a pipe. We wrap around the pipe our blanket and with few thermocouples we measure the T outside of the pipe and the T outside skin of the blanket. We obtain the temp drop from the hot side to the cold side. With this method I'm only able to control the temperature of the outside pipe opening or closing the valve of the propane tank. We have been asked to measure the mass flow rate, but in the configuration described I do not have access to it. If you have suggestion on different configuration how to set up the test, it will be great. I'm not sure I can calculate the air-fuel ratio of a propane torch tank
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