Comparing Kaveri engine to some similar good engines & also F-22's F119
I made a concurrent graph bringing all parameters of Kaveri to 100 & then adjusting other engines in same ratio, so now we can see what other engines have their parameters less or more.
This is a common person's approach - given a particular cylindrical space, how much air can be sucked in & thrust generated per unit engine volume.
Values near the 100 line with less deviation :
> The Turbine inlet temp. of other engines is just 100-200 K more.
> Dry SFC, except for F119 which is unusually low.
> Compressor + Turbine stages just b/w 10-12.
- EJ-200 has 1 less HPC stage yet its OPR is more than M-88-2 & Kaveri & equal to F119.
- Increasing 1 HPC stage in F414 increases OPR to 30.
> Engine length 349-399 cm. I wonder - after flame holder, how long should be a tail pipe.
> Dry thrust b/w 50-60 KN.
> Air mass flow of others is lesser, except F119 obviously.
Big variations :
> Parameters much higher :
- BPR of all engines is more, especially EJ-200 enabling EF-2000 to SuCr @ Mach 1.5. The F119 BPR is same as of M-88-2 but F-22 SuCr at M 1.8 but Rafale at M 1.4, although there are other design parameters also.
- Dry thrust/engine-weight of M-88-2 & EJ-200 are significantly high.
- Also the dry thrust/engine-volume.
> Parameters much lower :
- Inlet diameter/area, except F119
- Engine volume, except F119
- Engine weight, except F119
So what to do with Kaveri Engine?
> Change BPR from 0.16 to b/w 0.25 & 0.4
> Increase OPR by increasing 1 more HPC stage or re-engineer blades of current stages.
> Increase SFC little bit.
> Decrease engine weight.
> Re-engineer Afterburner & nozzle sections.
That's all an enthusiast can say
