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While in terms of reliability, simplicity and power to weight ratios turbine engines are great, they still suffer from low compression ratios. If I remember co
by VBprogrammer 12y ago
While in terms of reliability, simplicity and power to weight ratios turbine engines are great, they still suffer from low compression ratios.
If I remember correctly about 3 to 1, compared to 10 in 1 for petrol engines and nearly 20 to 1 for diesel engines.
Thermodynamically this makes it very difficult to achieve high efficiency.
- StillBored 12y ago"If I remember correctly about 3 to 1," That seemed strange to me given multistage compressors. Maybe 3:1 is true for a micro turbines, but for larger jets wikipedia says the pressure ratio is 30:1 to 40:1 citing the Trent 900 at 39:1 and the GE90 at 42:1. Which according to the same article says that a 40:1 PR is equivalent to a 15:1 compression ratio. http://en.wikipedia.org/wiki/Overall_pressure_ratio http://en.wikipedia.org/wiki/Overall_pressure_ratio
- VBprogrammer 12y agoI stand corrected. I'm sure I had read that some time ago but I can't find a reference at the moment.