Kerolox Configuration

[Tyaedalis]

@ferram4, if you let me know where your config for kerolox stands so far I will finish it up.

Parameters:

• O/F range: 0.1–60
• Optimal O/F range: 2–2.6
• Frozen Area Ratio: 1.3
• Pressure range: 0.25–100 MPa

O/F values to calculate:

• [x] 0.1
• [x] 0.5
• [x] 0.8
• [x] 1.0
• [x] 1.2
• [x] 1.5
• [x] 1.9
• [x] 2.0
• [x] 2.1
• [x] 2.2
• [x] 2.3
• [x] 2.4
• [x] 2.5
• [x] 2.6
• [x] 2.7
• [x] 2.8
• [x] 3.0
• [x] 3.5
• [x] 4.0
• [x] 5.0
• [x] 6.0
• [x] 10.0
• [x] 20.0
• [x] 30.0
• [x] 40.0
• [x] 50.0
• [x] 60.0

[ferram4]

The config hasn't changed on my end, so you can update it as needed. The pressures should probably be extended up to 100 MPa though. O/Fs need to be handled at both extremes, I know that with corrections the lower end can be down at 0.1 and it'll still solve and we need that for proper US gas generator engines. Make your judgment call on handling the super-ox-rich end, the detailed range is already set except for the higher pressures needed.

[ferram4]

Bring the higher O/F limit up to around 60. Russian staged-combustion engines need that kind of range to simulate oxygen-rich preburners. You shouldn't need too many data points though, the temp should ramp down smoothly on that end.

[Tyaedalis]

Got it.

[Tyaedalis]

Which, chemical were you using for kerosene, exactly? I'm getting slightly different values for everything I've tried (both RP-1 and T-1). I just want consistent data.

[ferram4]

I have been using RP-1. Because 'murica. Since RealFuels doesn't distinguish between RP-1, RG-1, T-1, etc. and they're very similar, we'll collapse it all to RP-1.

[Tyaedalis]

Okay. I think I'll just start from scratch with this config, for consistency's sake.

Just to show the kind of differences I'm looking at:

Mine:

MixtureRatioData
{
    OFratio = 1.2000000
    PressureData
    {   //      Pc,      Tc,        Te,       Pe,     MW,     gamma,  Mach
        key = 0.2500, 1736.6867, 1215.3640, 0.0572, 15.5677, 1.3291, 1.6342
        key = 1.0000, 1736.9763, 1215.3447, 0.2288, 15.5681, 1.3291, 1.6343
        key = 4.0000, 1737.1228, 1215.3398, 0.9154, 15.5683, 1.3291, 1.6343
        key = 6.0000, 1737.1514, 1215.3563, 1.3731, 15.5684, 1.3290, 1.6343
        key = 8.0000, 1737.1702, 1215.4247, 1.8308, 15.5685, 1.3289, 1.6345
        key = 10.0000, 1737.1849, 1215.6374, 2.2888, 15.5686, 1.3282, 1.6351
        key = 15.0000, 1737.2184, 1218.3548, 3.4403, 15.5689, 1.3201, 1.6415
        key = 20.0000, 1737.2615, 1225.6052, 4.6049, 15.5693, 1.3091, 1.6516
        key = 25.0000, 1737.3325, 1235.7574, 5.7972, 15.5700, 1.3059, 1.6534
        key = 30.0000, 1737.4569, 1245.9511, 7.0037, 15.5711, 1.3065, 1.6516
        key = 35.0000, 1737.6703, 1255.4961, 8.2183, 15.5727, 1.3083, 1.6489
        key = 40.0000, 1738.0198, 1264.2563, 9.4362, 15.5754, 1.3106, 1.6463
        key = 50.0000, 1739.3502, 1279.7405, 11.8760, 15.5848, 1.3156, 1.6420
    }
}

Yours:

MixtureRatioData
{
    OFratio = 1.2
    PressureData
    {  //    Pc,   Tc,        Te,        Pe,     MW,      gamma,  Mach
        key = 0.25, 1736.7313, 1218.5982, 0.0574, 15.5797, 1.3216, 1.6375
        key = 1.00, 1737.6815, 1242.7578, 0.2331, 15.6702, 1.2917, 1.6473
        key = 2.00, 1739.7833, 1270.8181, 0.4739, 15.7825, 1.2820, 1.6441
        key = 4.00, 1746.7642, 1307.4224, 0.9622, 15.9462, 1.2814, 1.6371
        key = 6.00, 1755.7430, 1331.9921, 1.4532, 16.0662, 1.2842, 1.6331
        key = 8.00, 1765.3024, 1350.7030, 1.9452, 16.1623, 1.2873, 1.6306
        key = 10.0, 1774.7707, 1365.9304, 2.4377, 16.2430, 1.2900, 1.6290
        key = 15.0, 1796.6927, 1395.1354, 3.6695, 16.4037, 1.2958, 1.6266
        key = 20.0, 1815.8353, 1417.1328, 4.9032, 16.5286, 1.3002, 1.6251
        key = 25.0, 1832.6195, 1434.9029, 6.1377, 16.6318, 1.3037, 1.6241
        key = 30.0, 1847.5216, 1449.8813, 7.3729, 16.7203, 1.3067, 1.6223
        key = 40.0, 1873.0850, 1474.3015, 9.8425, 16.8678, 1.3113, 1.6223
        key = 50.0, 1894.5400, 1493.9944, 12.3158, 16.9886, 1.3147, 1.6215
    }
}

[ferram4]

I see, comparing it to my 1.2. Very strange, not sure where the difference is. But sure, redo it for consistency's sake.

[Tyaedalis]

Ah, I forgot to switch out the thermo database configured for fuel rich calculations. That means UDMH + NTO is inaccurate. How much does that affect things?

[ferram4]

At the oxidizer-rich and ideal range it won't affect things much at all. At the fuel-rich end before it's supposed to exist it'll cause lower temps. Which is the reason the appropriate behavior there is to simulate the corrected and uncorrected databases and take a weighted average of the results to smooth out the discrepancy when switching.

So I'd double-check the richer end and only look to fix those ones.

[Tyaedalis]

So, when doing simulations where those substances form you would like values using both databases?

[Tyaedalis]

Nevermind, I just needed to read it again.

[ferram4]

Closed by #8