MTFDarkEagle Posted August 13, 2009 Posted August 13, 2009 Hi guys, installed the patch, nice work! Just one question, as I was starting up the shark, i noticed weird temp's from the APU's EGT. It starts up as usual, but peaks at 700, then at full rpm it drops back? I'm not a phisicist of Einstein calibre, but that doesnt make sense? Or does it? Lukas - "TIN TIN" - 9th Shrek Air Strike Squadron TIN TIN's Cockpit thread
Focha Posted August 13, 2009 Posted August 13, 2009 I'm not a Black Shark expert, but it makes sense if the APU is like a turbine. When starting up a turbine you have a peak of temperature when you increase the fuel and the RPM is still low and then decrease when the air and fuel start to mix in the proper scale with the increase of RPM, so when the turbine is stable or at it's optimum RPM there should be a lower temperature than at the start. If there were a maximum at the end of the start, then something was wrong. Regards. 1 ASUS N552VX | i7-6700HQ @ 2.59GHz | 16 GB DDR3 | NVIDIA GF GTX 950M 4 Gb | 250 Gb SSD | 1 Tb HD SATA II Backup | TIR4 | Microsoft S. FF 2+X52 Throttle+Saitek Pedals | Win 10 64 bits
MTFDarkEagle Posted August 13, 2009 Author Posted August 13, 2009 I'm not a Black Shark expert, but it makes sense if the APU is like a turbine. When starting up a turbine you have a peak of temperature when you increase the fuel and the RPM is still low and then decrease when the air and fuel start to mix in the proper scale with the increase of RPM, so when the turbine is stable or at it's optimum RPM there should be a lower temperature than at the start. If there were a maximum at the end of the start, then something was wrong. Regards. It makes sense now :music_whistling: Thanks to this a moment of enlightenment! Forgot about air/fuel mixtures and stable rpm! Thanks! Lukas - "TIN TIN" - 9th Shrek Air Strike Squadron TIN TIN's Cockpit thread
Tango Posted August 14, 2009 Posted August 14, 2009 I've noticed that the EGTs drop quickly on shutdown. Is this how it is on the real aircraft, or a bug? Best regards, Tango.
mvsgas Posted August 14, 2009 Posted August 14, 2009 (edited) I've noticed that the EGTs drop quickly on shutdown. Is this how it is on the real aircraft, or a bug? Best regards, Tango. I do not work on helicopters, but every turbine engine I have work on, when you shut down you have a rapid decent in EGT temperature. It should, in most cases hover around 200 to 100 degrees Celsius after shutdown, then it will cool slowly. Is all about airflow. Keep in mind I a speaking generally, like I said, I have never work on helicopters. Alpha16 or Yo-Yo will hopefully enlighten us. Edited August 14, 2009 by mvsgas To whom it may concern, I am an idiot, unfortunately for the world, I have a internet connection and a fondness for beer....apologies for that. Thank you for you patience. Many people don't want the truth, they want constant reassurance that whatever misconception/fallacies they believe in are true..
MTFDarkEagle Posted August 14, 2009 Author Posted August 14, 2009 I do not work on helicopters, but every turbine engine I have work on, when you shut down you have a rapid decent in EGT temperature. It should, in most cases hover around 200 to 100 degrees Celsius after shutdown, then it will cool slowly. Is all about airflow. Keep in mind I a speaking generally, like I said, I have never work on helicopters. Alpha16 or Yo-Yo will hopefully enlighten us. Yes, if you cut the fuel, there is no ignition. The metal of the turbine is still very warm, so that will need to cool too Lukas - "TIN TIN" - 9th Shrek Air Strike Squadron TIN TIN's Cockpit thread
ED Team Yo-Yo Posted August 14, 2009 ED Team Posted August 14, 2009 (edited) The EGT gauge inertia in 1.0 was too large by mistake. Now it gets normal so you can see instant overtemperature on start up and temperature drop when duct valves close at 86% of GG_rpm. In BS for indication we use only gas temperature regardless of metal case temperature. In A-10 we added a BODY (metal case) heat exchange to have temperature reading closer to real and to make engine motoring useful. Edited August 14, 2009 by Yo-Yo Ніщо так сильно не ранить мозок, як уламки скла від розбитих рожевих окулярів There is nothing so hurtful for the brain as splinters of broken rose-coloured spectacles. Ничто так сильно не ранит мозг, как осколки стекла от разбитых розовых очков (С) Me
miguez Posted August 14, 2009 Posted August 14, 2009 Thanks for the info Yo-Yo. Is it actually possible to overtemp the APU on startup in BS?
MTFDarkEagle Posted August 14, 2009 Author Posted August 14, 2009 so that means there wil be 2 gauges for APU temps in the a10? Lukas - "TIN TIN" - 9th Shrek Air Strike Squadron TIN TIN's Cockpit thread
ARM505 Posted August 14, 2009 Posted August 14, 2009 No, just an extra variable to make the one reading more closely reflect reality.
MTFDarkEagle Posted August 14, 2009 Author Posted August 14, 2009 Its just a extra simulation incorporated in the game? Lukas - "TIN TIN" - 9th Shrek Air Strike Squadron TIN TIN's Cockpit thread
miguez Posted August 14, 2009 Posted August 14, 2009 Right, the idea is that after you shut down a turbine, the gas temperature, meaning the air going through that motor, decreases tremendously fast. Think about the temperature of the air entering the engine. When the engine is working, it goes up at first due to the compression of the compressor stages, then it jumps up when the fuel/air mixture ignites. Once the engine is off, the temperature of the air going through the engine does not change much (keep in mind it still goes up, as it is still compressed some). In the real world, though, the temperature of the air going through an engine that was just turned off goes up more than what I indicated above, because all of the metal parts composing the engine, but especially the combustion chamber and exhaust metals are still very hot, and heat up the air through radiation. Sounds like in BS the metal temperatures are not modeled, so the EGT temperature drops dramatically. In the A-10 they are, so the EGT temperature takes longer to decrease. Makes sense?
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