thank you very much the CFD simulation really helps in the understand of very difficult experiments like hypersonic flow flow of airplane with velocity 10 times of speed of sound will be simulated easily rather than testing
Is there any weird heat conductance at hypersonic speeds? Since it seems like the craft is performing an exothermic reaction (splitting air molecules) which is then heating up the aircraft, is there much loss of heat or is the craft moving so fast that there is little chance for the expulsion of excess heat into the atmosphere?
I see your comment is a year old but I feel compelled to answer because it’s really simple actually. Heat is thermal energy caused by your molecules jumping around. To transfer thermal energy, your molecules must run into something else’s molecules. So if no air is interacting with the craft, all heat gained will stay in the craft.
@@breadwatcher3908 I appreciate your response. My comment may not have been worded the best. One of the major issues with hypersonic flight is heat generated from air resistance. The thing I’ve always found interesting about that is that typically at altitudes where this is possible, the ambient temperature is extremely low. That would make you think there is significant heat loss to the environment. But I guess, in the past year I’ve learned more about sound barriers and whatnot, and based off your comment it seems like in reality the vehicle is not coming into contact with the atmospheric air, but instead the shockwaves are making contact, thereby decreasing the actual ability of the vehicle to offput heat into the environment. This actually might explain a lot. Please correct me if I’m wrong.
@@breadwatcher3908 Just to let you know, I’m also considering atmospheric reentry by spacecraft in this because that is also technically hypersonic flight.
@@breadwatcher3908 there’s a lot of interesting research that could have potential applications to hypersonic flight provided you can develop a solid method for heat transfer. I also wonder about the maneuverability capabilities of these vehicles because you would think that any object operating at those internal temperatures undergoing stress from any deviations in course would structurally compromise the entire air vehicle.
@@casey6104 Ah I understand your question a little better and I believe you’re 99% correct. I’m not an expert on this topic but I don’t think atmospheric reentry is always at supersonic speeds. Even though the atmosphere has a low ambient temp, aircraft heat up during atmospheric reentry(and often times become a big ball of fire) due to drag caused by skin friction. Air molecules can’t move out the way fast enough and just combust. But in supersonic flight, we do not see these crafts engulfed in a big fireball. So I assume there’s a range of speed where you’ll get hotter and hotter because air is having to slide past you, and then a range of speeds where air just doesn’t even touch you due to the higher speed. I think that higher speed makes a shockwave that acts like a barrier pushing the air entirely around you instead of the air sliding past you.
thank you very much
the CFD simulation really helps in the understand of very difficult experiments like hypersonic flow
flow of airplane with velocity 10 times of speed of sound will be simulated easily rather than testing
Hypersonic🚀
Is there any weird heat conductance at hypersonic speeds? Since it seems like the craft is performing an exothermic reaction (splitting air molecules) which is then heating up the aircraft, is there much loss of heat or is the craft moving so fast that there is little chance for the expulsion of excess heat into the atmosphere?
I see your comment is a year old but I feel compelled to answer because it’s really simple actually. Heat is thermal energy caused by your molecules jumping around. To transfer thermal energy, your molecules must run into something else’s molecules. So if no air is interacting with the craft, all heat gained will stay in the craft.
@@breadwatcher3908 I appreciate your response. My comment may not have been worded the best. One of the major issues with hypersonic flight is heat generated from air resistance. The thing I’ve always found interesting about that is that typically at altitudes where this is possible, the ambient temperature is extremely low. That would make you think there is significant heat loss to the environment. But I guess, in the past year I’ve learned more about sound barriers and whatnot, and based off your comment it seems like in reality the vehicle is not coming into contact with the atmospheric air, but instead the shockwaves are making contact, thereby decreasing the actual ability of the vehicle to offput heat into the environment. This actually might explain a lot. Please correct me if I’m wrong.
@@breadwatcher3908 Just to let you know, I’m also considering atmospheric reentry by spacecraft in this because that is also technically hypersonic flight.
@@breadwatcher3908 there’s a lot of interesting research that could have potential applications to hypersonic flight provided you can develop a solid method for heat transfer. I also wonder about the maneuverability capabilities of these vehicles because you would think that any object operating at those internal temperatures undergoing stress from any deviations in course would structurally compromise the entire air vehicle.
@@casey6104 Ah I understand your question a little better and I believe you’re 99% correct. I’m not an expert on this topic but I don’t think atmospheric reentry is always at supersonic speeds. Even though the atmosphere has a low ambient temp, aircraft heat up during atmospheric reentry(and often times become a big ball of fire) due to drag caused by skin friction. Air molecules can’t move out the way fast enough and just combust. But in supersonic flight, we do not see these crafts engulfed in a big fireball. So I assume there’s a range of speed where you’ll get hotter and hotter because air is having to slide past you, and then a range of speeds where air just doesn’t even touch you due to the higher speed. I think that higher speed makes a shockwave that acts like a barrier pushing the air entirely around you instead of the air sliding past you.