Poboljšanje slike strujanja u tarnoj pumpi

undergraduate thesis

• Title (english): Improvement of flow pattern in friction pump
• Author: Josip Katavić
• Mentor: Severino Krizmanić (mentor)
• Granter: University of Zagreb; Faculty of Mechanical Engineering and Naval Architecture; Zagreb
• Defense date and country: 2016-03-02, Croatia
• Scientific / art field, discipline and subdiscipline: TECHNICAL SCIENCES; Mechanical Engineering; Precision Mechanical Engineering

Abstract

U ovom završnom radu provedene su modifikacije geometrije strujnih dijelova tarne pumpe koje su dovele do poboljšanja slike strujanja u smislu smanjenja područja s recirkulacijskim strujanjem. Geometrija strujnih dijelova tarne pumpe modelirana je u komercijalnom CAD i CAE programskom paketu SOLIDWORKS na pojednostavljeni način poradi zaključaka izvedenih u prethodnih radovima. Modelirano je više geometrija. Značajna su dva konstrukcijska rješenja. Prvo konstrukcijsko rješenje je namijenjeno radnom području pri većim volumnim protocima. Drugo konstrukcijsko rješenje, ujedno i usvojeno, namijenjeno je širem radnom području. U radu je prikazan put do usvojenog konstrukcijskog rješenja, popraćen prikazima geometrija, prostornih diskretizacija i strujnica. Nakon prvoga konstrukcijskog rješenja, prikazana je usporedba rezultata računalne simulacije s približnim analitičkim rješenjem uzimajući prirast tlaka kao glavni parametar te interpretacija odstupanja rješenja. Prikazana su polja tangencijalnih naprezanja po zidovima modela i u struji radnoga fluida koja nema doticaja sa zidovima u radnoj točki pumpe koja odgovara čovjeku koji boluje od hipertenzije. Prikazana je usporedba s poljima iz prethodnog rada na što je dan osvrt. Na kraju rada je dan prikaz dviju radnih karakteristika pumpe pri različitim brojevima okretaja i međuovisnosti prirasta tlaka o brzini vrtnje vratila pri konstantnom volumnom protoku. Prostorna diskretizacija modela provedena je korištenjem platforme SALOME. Numerički proračun, uz stacionarne uvjete strujanja, je proveden u računalnom programu OpenFOAM.

Abstract (english)

In this baccalareus graduate thesis geometry modifications of pump parts which affect working fluid flow are made. Those modifications improved the flow pattern and therefore recirculation flow areas were minimized. Friction pump geometry is modified using a commercial solid modelling computer-aided design (CAD) and computer-aided engineering (CAE) computer program SOLIDWORKS. Friction pump geometry is simplified by following conclusions from the past research. Several geometry modifications are made. There are two main design solutions. First design solution is purposed for higher volume rate operating range. The second design solution is purposed for wider volume rate operating range. Second design solution is adopted. In this thesis design stages are attached. Geometry modifications, mesh discretization of a domain and streamlines are also attached in every design stage. After the first construction design, comparison between computer simulation results and the approximate analytical solution is made taking the increase in pressure as a main parameter. Difference between them is analyzed. Fields of wall shear stress and shear stress in the power of the working fluid which has no contact with the walls of the operating point of the pump which benefits a man suffering from hypertension are attached. The comparison with the subjects from the previous work is reflected here. At the end of this thesis, two pump characteristic curves Q-Δp (for the same shaft rotational speed but different volume flow rate) and pressure increase - shaft rotation speed Δp-n (for the constant volume flow rate) are attached. Domain is discretized using a SALOME platform. Numerical calculations of steady-state flow is performed using OpenFOAM, software tool for computional fluid dynamics.

• Keywords: računalna dinamika fluida; srčana pumpa; tarna pumpa; bezlopatična pumpa; Teslina pumpa; radna karakteristika tarne pumpe
• Keywords (english): computional fluid dynamics; blood pump; Tesla pump left ventricular assist device; friction pump; bladeless pump; Tesla pump; friction pump characteristic curve
• Language: croatian
• URN:NBN: urn:nbn:hr:235:071972
• Study programme: Title: Mechanical Engineering; Study programme type: university; Study level: undergraduate; Academic / professional title: sveučilišni/a prvostupnik/ prvostupnica (baccalaureus/baccalaurea) inženjer/inženjerka strojarstva (sveučilišni/a prvostupnik/ prvostupnica (baccalaureus/baccalaurea) inženjer/inženjerka strojarstva)
• Type of resource: Text
• File origin: Born digital
• Access conditions: Open access
• Created on: 2019-05-27 10:08:56