Gas Dynamics Calculator
iOS app by 德海 于. Education · 德海 于
- Store rating
- 0 / 5
- Store rating count
- 0
- Download price
- 9.99 USD
- In-app purchases
- Unknown
- Version
- 1.0
- Listing last refreshed
- 2026-09-09
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Store description excerpt
Isentropic flow, normal and oblique shocks, Prandtl-Meyer expansion, Rayleigh flow with heat addition, Fanno flow with friction, and a converging-diverging nozzle across its whole range of back pressures. Seven modules, fifty-nine displayed relations, and a way to chain them into flow paths. WHAT IT DOES State one flow and read every relation at that station: pressure, temperature and density ratios, area ratio, characteristic Mach number, Mach angle, Prandtl-Meyer angle. Work backwards just as easily — give a pressure ratio and get the Mach number, give a Pitot reading and get the flow that produced it. Each module solves in both directions and shows the formula it used. A number without its relation is a number you cannot check; a number with its relation is a step of working. FLOW PATHS Real geometry is not one process. Put an oblique shock in front of an expansion, a shock train ahead of a diffuser, heat addition after a contraction — and read what survived. Total temperature, total pressure and entropy are tracked across every station, because total-pressure recovery is the number a design is judged on. Named arrangements are built in, and any path can be extended, reordered or duplicated. WORKED SOLUTIONS Export the given, every relation beside its value, the ledger of what was conserved and what was lost, and a reference list — as Markdown or plain text. It is a document you can file, hand in, or paste into a report. CHARTS AND TABLES Every ratio has its own chart with the current station marked. Area ratio against Mach number shows both roots on one curve. The nozzle's exit Mach is plotted against back pressure across all four regimes, so the shock-at-exit threshold is somewhere you can see rather than somewhere you have to trust. Tables run the classical ranges at the current gamma. BUILT TO BE CHECKED Two independent implementations of the same relations agree to the last bit across 10,784 tabulated values. The oblique-shock charts are checked against NACA Report 1135; the standard atmosphere follows ISO 2533 from five kilometres below sea level to forty-seven above. Verification is arithmetic at sixty digits, not a spot check. Gamma is adjustable from 1.1 to 1.67, with air, helium and rocket exhaust as presets, and a custom gas constant. SI and imperial units throughout. WHAT IT DOES NOT DO Every relation here is exact for a calorically perfect gas: gamma and R constant. That is the assumption the classical theory is built on, and the app says so when a result has left the range where it holds. There is no variable-specific-heat model, no high-temperature chemistry, no CFD. It is not qualified for flight safety, certification, or unverified critical engineering decisions. PRIVACY No account, no network, no analytics, no data collection of any kind. The app cannot open a connection — there is no networking code in it. Your work stays on your device. One purchase covers Mac and iPad. No subscription, no in-app purchase
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