![]() * Information listed above is at the time of submission. The fluid property data resulting from these studies would best serve the engineering community if made available in the REFPROP program from the NIST and this proposal seeks to author the collected data into a freely-availablenbsp library under NIST direction.nbsp Additionally, although the freezing point of MMH approaches -60deg C and it should be usable with MON down to -40deg C, the viscosity of MMH increase rapidly below 0deg C.nbsp This may causenbsp flow and mixing problems that can inhibit ignition and steady operation.nbsp In a previous Department of Defense program, it was demonstrated that adding a compound to a similar fuel resulted innbsp lower viscosity without negatively impacting combustion efficiency.nbsp To characterize the results of blending MMH similarly, this proposal also seeks to investigatenbsp key physical properties of MMH-blends at cold temperatures andnbsp perform hypergolic ignition and hypergolic performance testing with MON-25.nbsp Like the MON data, the results of these studies will be authored into the REFPROP libraries for general distribution. Here you can see the input and output values -> change the order as you can find it in the manual.txt (subroutine TPFLSH (t,p,z,D,Dl,Dv,x,y,q,e,h,s,cv,cp,w,ierr,herr)) -> OK -> from "Initialize Array" delete the lower cable and make a new connection with the slot above the upper one -> enter front panel -> right click the output cluster -> "Rearrange elements in cluster." -> choose the same order as in manual.txt -> in Test.vi block diagram replace the "2 phase ph-flash" with the new "2 phase tp-flash" delete the indicator and copy/paste it from "Two phase tp-flash.vi" -> start the VI -> all calculated values (density.) should be identical.The REFPROP program developed by the National Institute of Standards and Technology (NIST) is a widely-used database for industrial fluid properties, including propellants used for chemical rocket propulsion.nbsp For deep space applications, low-temperature propellants are of particular interest but accurate fluid property data was scarce or unavailable to the industry.nbsp Recently, NASA MSFC has funded several research programs (including this proposal#39 s phase I contract) to develop capabilities of handling and measuring the physical, thermodynamic, and system properties of Modified Oxides of Nitrogen (MON), which is Nitrogen Tetraoxide (NTO) blended with various percentages of Nitrous Oxide.nbsp High-MON blends (15-30% NO) have a significantly lower freezing point than neat NTO and promise to enable cold-propellant operation in hypergolic rocket engines when paired with Monomethyl Hydrazine (MMH). NIST REFPROP PROGRAM UPGRADEAgile management software built for your team Icon. NIST Reference Fluid Thermodynamic and Transport Properties Database v10 - Upgrade from previous version. For the NIST REFPROP program: NIST2309.zip. CoolProp A cross-platform, open-source, alternative to NIST REFPROP. Uncheck it and browse the path to RefProp.dll -> Look for TPFLSHdll in the drop down menu -> check "enter path in block diagram" -> go to parameters. There are some additional programs that are essential to calculating coils: For the sporlan program: SPORLAN V5. Open "Example for phflsh.llb" -> open Test.vi -> enter block diagram -> double content of right frame -> change caption and input values -> enter "Two phase ph-flash.vi" -> Save as new copy "Two phase tp-flash.vi" in "Example for phflsh.llb" -> close "Two phase ph-flash.vi" -> edit vi symbol -> enter block diagram -> double click "Call Libary Function Node" -> since "enter path in block diagram" is checked, you cannot change the dll function. Here's what I did (since I'm using the german version, I had to translate the commands. Attached you find your VI and a manual.txt for using RefProp with other programs. Click on Change Source and navigate to C:Program FilesREFPROP. Enhancements have been made to most areas of the NIST REFPROP program, including the equations of state for many of the pure fluids and mixtures, the transport equations, the graphical interface, the Excel spreadsheet, the Fortran files (i.e., core property routines), the sample programs in Python, C++, MATLAB, VB, etc. ![]()
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