Design of a New Centrifugal Pump Impeller

Nowadays, the usage of computer software to assist designer for designing equipment has been highly regarded. The objective of this project is to understand the basic principle of centrifugal pump and also the procedure to design the centrifugal pump impeller. Besides that, other objective of this project is to construct the designed impeller in 2D and 3D model. The problem identified for this project is the challenge for the pump designer to design the new centrifugal pump impeller with best possible performance. Besides that, pump designer can only rely to the previous data to design the impeller and also based on the past experience. Basically, there are various stages required to complete the project within the timeline. After the project has been defined, the detailed research is performed. The next phase of the project is the designing stage which is when the impeller is designed by using the Computer Aided Design (CAD). Each parts of the centrifugal pump impeller should be designed according to the research and calculation obtained. As the result, the data had been obtained according to the basic specification of the new centrifugal pump. Based on the data, the impeller has been constructed in 2D and 3D model. Besides that, the right material selection of the centrifugal pump impeller has been identified. As the conclusion, this project is successful and the objectives have been completed within the time frame

Автоматизированное проектирование рабочего колеса центробежного насоса

Предлагается алгоритм первого этапа проектирования на ЭВМ проточной части (ПЧ) рабочего колеса (РК) центробежного насоса (ЦН), который основан на законах течения рабочей жидкости, определяемых уравнениями Эйлера – движения, передачи и сохранения энергии, уравнением неразрывности, а также на большом опыте их примененияIt was proposed algorithm of the first stage computer-aided design flowing part of the impeller of a centrifugal pump, which based on fluid flow laws that are determined by the Euler equations, such us: equation of motion, energy-conservation equation, equation of energy transfer and continuity equation, and on the great experience of their applicatio

Investigation of Parameters Affecting Axial Load in an End Suction Centrifugal Pump by Numerical Analysis

The total force produced in the axial direction on a pump is called axial load and is caused by the pressure difference between the front and rear of the impeller and the hydrostatic force in the suction direction. In a centrifugal pump, 3D computer-aided analysis programs are used to design and reduce R&D and manufacturing costs. In this study, parameters affecting axial load of the centrifugal pump with a single suction and closed impeller were investigated by using the Computational Fluid Dynamics (CFD) method. In this context, the flow rate and the some physical properties such as the back gap of the impeller, wear ring and balancing holes, of the centrifugal pump were investigated to determine how much affected the axial load. The results showed that the wear ring and the balancing holes give rise to effective results on the axial load, while the back gap of the impeller does not affect the large extent. With the design changes made with these parameterizations, the axial force was reduced by up to 60%, whereas the efficiency was decreased by 5%. The loss of efficiency due to this decrease in axial force is negligible. However, higher efficiency values were also found at a different point from the working point where the axial load is lowest

Investigation of Parameters Affecting Axial Load in an End Suction Centrifugal Pump by Numerical Analysis

The total force produced in the axial direction on a pump is called axial load and is caused by the pressure difference between the front and rear of the impeller and the hydrostatic force in the suction direction. In a centrifugal pump, 3D computer-aided analysis programs are used to design and reduce R&D and manufacturing costs. In this study, parameters affecting axial load of the centrifugal pump with a single suction and closed impeller were investigated by using the Computational Fluid Dynamics (CFD) method. In this context, the flow rate and the some physical properties such as the back gap of the impeller, wear ring and balancing holes, of the centrifugal pump were investigated to determine how much affected the axial load. The results showed that the wear ring and the balancing holes give rise to effective results on the axial load, while the back gap of the impeller does not affect the large extent. With the design changes made with these parameterizations, the axial force was reduced by up to 60%, whereas the efficiency was decreased by 5%. The loss of efficiency due to this decrease in axial force is negligible. However, higher efficiency values were also found at a different point from the working point where the axial load is lowest

Design study of a regenerative pump using one-dimensional and three-dimensional numerical techniques

Regenerative pumps are low cost, compact, able to deliver high heads at low flow rates. Furthermore with stable performance characteristics they can operate with very small NPSH. The complexity of the flow field is a serious challenge for any kind of mathematical modelling. This paper compares an analytical and numerical technique of resolving the performance for a new regenerative pump design. The performance characteristics computed by a CFD approach and a new one-dimensional model are compared and matched to experimental test results. The approaches of both modelling techniques are assessed as potential design tools. The approaches are shown to not only successfully resolve the complex flow field within the pump; the CFD is also capable of resolving local flow properties to conduct further refinements. The flow field is represented by the CFD as it has never been before. A new design process is suggested. The new regenerative pump design is considered with a comparable duty centrifugal pump, proving that for many high head low flow rate applications the regenerative pump is a better choice

Автоматизированное проектирование рабочего колеса центробежного насоса

Предлагается алгоритм первого этапа проектирования на ЭВМ проточной части (ПЧ) рабочего колеса (РК) центробежного насоса (ЦН), который основан на законах течения рабочей жидкости, определяемых уравнениями Эйлера – движения, передачи и сохранения энергии, уравнением неразрывности, а также на большом опыте их примененияIt was proposed algorithm of the first stage computer-aided design flowing part of the impeller of a centrifugal pump, which based on fluid flow laws that are determined by the Euler equations, such us: equation of motion, energy-conservation equation, equation of energy transfer and continuity equation, and on the great experience of their applicatio

Development of dry coal feeders

Design and fabrication of equipment of feed coal into pressurized environments were investigated. Concepts were selected based on feeder system performance and economic projections. These systems include: two approaches using rotating components, a gas or steam driven ejector, and a modified standpipe feeder concept. Results of development testing of critical components, design procedures, and performance prediction techniques are reviewed

Computer-aided applications in process plant safety

Process plants that produce chemical products through pre-designed processes are fundamental in the Chemical Engineering industry. The safety of hazardous processing plants is of paramount importance as an accident could cause major damage to property and/or injury to people. HAZID is a computer system that helps designers and operators of process plants to identify potential design and operation problems given a process plant design. However, there are issues that need to be addressed before such a system will be accepted for common use. This research project considers how to improve the usability and acceptability of such a system by developing tools to test the developed models in order for the users to gain confidence in HAZID s output as HAZID is a model based system with a library of equipment models. The research also investigates the development of computer-aided safety applications and how they can be integrated together to extend HAZID to support different kinds of safety-related reasoning tasks. Three computer-aided tools and one reasoning system have been developed from this project. The first is called Model Test Bed, which is to test the correctness of models that have been built. The second is called Safe Isolation Tool, which is to define isolation boundary and identify potential hazards for isolation work. The third is an Instrument Checker, which lists all the instruments and their connections with process items in a process plant for the engineers to consider whether the instrument and its loop provide safeguards to the equipment during the hazard identification procedure. The fourth is a cause-effect analysis system that can automatically generate cause-effect tables for the control engineers to consider the safety design of the control of a plant as the table shows process events and corresponding process responses designed by the control engineer. The thesis provides a full description of the above four tools and how they are integrated into the HAZID system to perform control safety analysis and hazard identification in process plants

Development of a regenerative pump impeller using rapid manufacturing techniques

This paper presents a method of rapid manufacture used in the development of a regenerative pump impeller. Rapid manufacturing technology was used to create complex impeller blade profiles for testing as part of a regenerative pump optimisation process. Regenerative pumps are the subject of increased interest in industry. Ten modified impeller blade profiles, relative to the standard radial configuration, were evaluated with the use of computational fluid dynamics and experimental testing. Prototype impellers were needed for experimental validation of the CFD results. The manufacture of the complex blade profiles, using conventional milling techniques, is a considerable challenge for skilled machinists. The complexity of the modified blade profiles would normally necessitate the use of expensive CNC machining with 5 asis capability. With an impeller less than 75mm in diameter and a maximum blade thickness of 1.3mm, a rapid manufacturing technique enabled production of complex blade profiles that were dimensionally accurate and structurally robust enough for testing. As more advanced rapid prototyping machines become available in the study in the future, e.g. 3D photopolymer jetting machine, the quality of the parts, particularly in terms of surface finish, will improve and the amount of post processing operations will reduce. This technique offers the possibility to produce components of increased complexity whilst ensuring quality, strength, performance and speed of manufacture. The ability to manufacture complex blade profiles that are robust enough for testing, in a rapid and cost effective manner is proving essential in the overall design optimisation process for the pump